BS en 01806-2006

BRITISH STANDARD BS EN
1806:2006
Chimneys —
Clay/ceramic flue
blocks for single wall
chimneys —
Requirements and test
methods
The European Standard EN 1806:2006 has the status of a

British Standard
ICS 91.060.40; 91.100.25
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BS EN 1806:2006
National foreword
This British Standard is the official English language version of

EN 1806:2006. It supersedes BS EN 1806:2000 which is withdrawn.
The UK participation in its preparation was entrusted to Technical Committee
B/506, Chimneys, which has the responsibility to:
— aid enquirers to understand the text;
— present to the responsible international/European committee any

enquiries on the interpretation, or proposals for change, and keep UK
interests informed;
— monitor related international and European developments and
promulgate them in the UK.
A list of organizations represented on this committee can be obtained on

request to its secretary.
Cross-references
The British Standards which implement international or European
publications referred to in this document may be found in the BSI Catalogue
under the section entitled “International Standards Correspondence Index”, or
by using the “Search” facility of the BSI Electronic Catalogue or of British
Standards Online.
This publication does not purport to include all the necessary provisions of a
contract. Users are responsible for its correct application.
Compliance with a British Standard does not of itself confer immunity
from legal obligations.
Summary of pages
This document comprises a front cover, an inside front cover, the EN title page,
pages 2 to 59 and a back cover.
The BSI copyright notice displayed in this document indicates when the
document was last issued.
This British Standard was Amendments issued since publication

published under the authority
of the Standards Policy and
Strategy Committee Amd. No. Date Comments
on 31 August 2006
© BSI 2006
ISBN 0 580 48889 6

EUROPEAN STANDARD EN 1806
NORME EUROPÉENNE
EUROPÄISCHE NORM July 2006
ICS 91.060.40; 91.100.25 Supersedes EN 1806:2000
English Version
Chimneys - Clay/ceramic flue blocks for single wall chimneys -

Requirements and test methods
Conduits de fumée - Boisseaux en terre cuite/céramique Abgasanlagen - Keramik - Formblöcke für einschalige
pour conduits de fumée simple paroi - Exigences et Abgasanlagen - Anforderungen und Prüfmethoden
méthodes d'essai
This European Standard was approved by CEN on 19 June 2006.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the Central Secretariat or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,
Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION

COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2006 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1806:2006: E
worldwide for CEN national Members.
EN 1806:2006 (E)
Contents Page
Foreword..............................................................................................................................................................5
1 Scope ......................................................................................................................................................6
2 Normative references ............................................................................................................................6
3 Terms and definitions ...........................................................................................................................7
4 Types of flue blocks ............................................................................................................................10
5 Materials ...............................................................................................................................................11
5.1 Flue blocks ...........................................................................................................................................11
5.2 Insulation ..............................................................................................................................................11
5.2.1 General..................................................................................................................................................11
5.2.2 Shape ....................................................................................................................................................12
5.2.3 Thermal conductivity of insulation ....................................................................................................12
5.2.4 Resistance to heat ...............................................................................................................................12
6 Tolerances on dimensions .................................................................................................................12
6.1 Internal transverse dimensions..........................................................................................................12
6.2 Height ....................................................................................................................................................12
6.3 Angles ...................................................................................................................................................12
6.4 Straightness .........................................................................................................................................12
6.5 Squareness of ends.............................................................................................................................12
6.6 Squareness of angles and flatness of walls .....................................................................................12
6.7 Joints ....................................................................................................................................................12
6.8 Bonding extension...............................................................................................................................13
6.9 Tolerance on insulation thickness.....................................................................................................13
7 Proof load .............................................................................................................................................13
7.1 Straight flue blocks..............................................................................................................................13
7.2 Angle flue blocks .................................................................................................................................13
7.3 Minimum load for inspection opening sections ...............................................................................13
7.4 Adhesion between outer wall and insulation....................................................................................14
8 Gas tightness and thermal shock resistance ...................................................................................14
8.1 Straight flues blocks ...........................................................................................................................14
8.1.1 General..................................................................................................................................................14
8.1.2 Initial gas tightness .............................................................................................................................14
8.1.3 Thermal shock resistance...................................................................................................................14
8.1.4 Final gas tightness after thermal shock testing ...............................................................................14
8.2 Angle flue blocks .................................................................................................................................14
9 Condensate resistance .......................................................................................................................15
10 Corrosion resistance ...........................................................................................................................15
11 Water absorption and bulk density....................................................................................................15
11.1 General..................................................................................................................................................15
11.2 Water absorption .................................................................................................................................15
11.3 Bulk density..........................................................................................................................................15
12 Abrasion resistance ............................................................................................................................16
13 Flow resistance ....................................................................................................................................16
14 Thermal resistance ..............................................................................................................................16
15 Resistance to fire .................................................................................................................................16
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EN 1806:2006 (E)
15.1 Internal to external ..............................................................................................................................16

15.1.1 Testing at normal operating conditions............................................................................................16
15.1.2 Soot fire test.........................................................................................................................................16
15.2 External to external .............................................................................................................................16
16 Resistance to freeze/thaw...................................................................................................................16
17 Evaluation of conformity ....................................................................................................................17
17.1 General .................................................................................................................................................17
17.2 Initial type testing ................................................................................................................................17
17.3 Further tests.........................................................................................................................................17
17.4 Factory production control.................................................................................................................17
18 Test methods .......................................................................................................................................18
18.1 Internal transverse dimensions .........................................................................................................18
18.2 Height....................................................................................................................................................18
18.3 Angles...................................................................................................................................................18
18.4 Straightness .........................................................................................................................................18
18.5 Squareness of ends ............................................................................................................................19
18.5.1 Gauge test ............................................................................................................................................19
18.5.2 Direct measurement test.....................................................................................................................20
18.6 Squareness of angles and flatness of walls .....................................................................................21
18.7 Proof load .............................................................................................................................................22
18.7.1 Test sample ..........................................................................................................................................22
18.7.2 Testing equipment...............................................................................................................................22
18.7.3 Procedure .............................................................................................................................................22
18.8 Thermal performance tests ................................................................................................................23
18.8.1 Test equipment ....................................................................................................................................23
18.8.2 Test flue ................................................................................................................................................24
18.8.3 Procedure .............................................................................................................................................25
18.8.4 Measurement of permeability rate .....................................................................................................29
18.9 Corrosion resistance test ...................................................................................................................30
18.9.1 Test specimens....................................................................................................................................30
18.9.2 Test equipment ....................................................................................................................................30
18.9.3 Procedure .............................................................................................................................................30
18.9.4 Expression of results ..........................................................................................................................31
18.10 Water absorption .................................................................................................................................31
18.10.1 Test specimen......................................................................................................................................31
18.10.2 Test equipment ....................................................................................................................................31
18.10.3 Procedure .............................................................................................................................................31
18.11 Bulk density .........................................................................................................................................32
18.11.1 Test specimen......................................................................................................................................32
18.11.2 Test equipment ....................................................................................................................................32
18.11.3 Procedure .............................................................................................................................................32
18.12 Abrasion resistance ............................................................................................................................32
18.12.1 Test flue ................................................................................................................................................32
18.12.2 Test equipment ....................................................................................................................................33
18.12.3 Procedure .............................................................................................................................................33
18.13 Condensate resistance test................................................................................................................35
18.13.1 Test section..........................................................................................................................................35
18.13.2 Test apparatus .....................................................................................................................................35
18.13.3 Procedure .............................................................................................................................................35
18.14 Adhesion test for insulation attached to outer wall of flue blocks ................................................36
18.14.1 Test specimen......................................................................................................................................36
18.14.2 Testing procedure ...............................................................................................................................36
18.14.3 Loading.................................................................................................................................................36
19 Designation ..........................................................................................................................................37
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EN 1806:2006 (E)
20 Marking, labelling and packaging ......................................................................................................38

Annex A (normative) Measurement of the coefficient of friction of chimneys ...........................................39
Annex B (normative) Thermal resistance .......................................................................................................41
B.1 Method 1 : simplified calculation for flue blocks without cavities .................................................41
B.2 Method 2 : thermal resistance of flue blocks with or without cavities...........................................41
B.2.1 General..................................................................................................................................................41
B.2.2 Data .......................................................................................................................................................42
B.2.3 Specific conditions for the cavities ...................................................................................................43
B.2.4 Calculations..........................................................................................................................................46
B.3 Method Approximate thermal resistance values..............................................................................46
Annex C (normative) Sampling procedures for an AQL of 10 % and Inspection Level S2 .......................47
C.1 Acceptability determination................................................................................................................47
C.1.1 General..................................................................................................................................................47
C.1.2 Single sampling ...................................................................................................................................47
C.1.3 Double sampling ..................................................................................................................................47
C.2 Normal inspection................................................................................................................................47
C.3 Normal to reduced inspection ............................................................................................................49
C.4 Reduced to normal inspection ...........................................................................................................49
C.5 Tightened inspection...........................................................................................................................49
C.6 Tightened to normal inspection .........................................................................................................50
C.7 Discontinuation of inspection ............................................................................................................50
Annex ZA (informative) Clauses of this European Standard addressing the provisions of EU
Construction Products Directives......................................................................................................51
ZA.1 Scope and relevant characteristics ...................................................................................................51
ZA.2 Procedure of attestation of conformity of clay/ceramic flue blocks ..............................................54
ZA.2.1 System of attestation of conformity ..................................................................................................54
ZA.2.2 EC certificate and declaration of conformity ....................................................................................54
ZA.3 CE Marking and labelling ....................................................................................................................55
Bibliography ......................................................................................................................................................59
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EN 1806:2006 (E)
Foreword
This document (EN 1806:2006) has been prepared by Technical Committee CEN/TC 166 “Chimneys”, the
secretariat of which is held by UNI.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by January 2007, and conflicting national standards shall be withdrawn at
the latest by January 2007.
This document supersedes EN 1806:2000.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive(s).
For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden,
Switzerland and United Kingdom.
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EN 1806:2006 (E)
1 Scope
This European Standard specifies the requirements for clay/ceramic flue blocks with solid walls or walls with
vertical perforations including bonding and non-bonding blocks and their fittings. Non-bonding flue blocks which
have insulation in the vertical perforations or attached to the outer walls are also covered by this standard. This
standard specifies the performance requirements for factory-made flue blocks.
When they are installed, they will form a part of a multi-wall chimney or a complete chimney which will serve to
convey products of combustion from fireplaces or heating appliances to the atmosphere.
This standard includes components used for domestic and industrial chimneys which are not structurally
independent (free-standing). Testing, marking and inspection requirements are covered by this standard.
NOTE 1 Flue blocks covered by this standard are manufactured in three forms :
a) single flue ;
b) multi-flue ;
c) flue/ventilation combination.
NOTE 2 Flue blocks may have flues which are either circular, square or rectangular. The joints may have a locating feature
such as a rebate.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references,
only the edition cited applies. For undated references, the latest edition of the referenced document (including any
amendments) applies.
EN 312, Particleboards – Specifications
EN 1443:2003, Chimneys – General requirements
EN 10088-1, Stainless steels – Part 1: List of stainless steels
EN 13384-1, Chimneys – Thermal and fluid dynamic calculation methods – Part 1: Chimneys serving one
appliance
EN 14297:2004, Chimneys – Freeze-thaw resistance test method for chimney products
EN ISO 6946, Building components and building elements - Thermal resistance and thermal transmittance -
Calculation method (ISO 6946:1996)
EN ISO 7500-1, Metallic materials - Verification of static uniaxial testing machines - Part 1: Tension/compression
testing machines - Verification and calibration of the force-measuring system (ISO 7500-1:2004)
ISO 2859-1, Sampling procedures for inspection by attributes – Part 1 : Sampling schemes indexed by acceptance
quality limit (AQL) for lot-by-lot inspection
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EN 1806:2006 (E)
3 Terms and definitions

For the purposes of this document, the following terms and definitions apply together with those given in
EN 1443:2003.
3.1
angle flue block
flue blocks designed to facilitate a change in angle of the axis of a flue (see Figure 2).
3.2
bonding extension
part of a flue block which is designed to be bonded into adjacent masonry walls, and forms no part of the chimney
3.3
bonding flue block
flue blocks designed to be built wholly or partially into a masonry wall and having a bonding extension
Bonding flue block Non-bonding flue block
Figure 1 — Examples of flue block shape
3.4
entry flue block
flue block connecting the chimney to the connecting flue pipe or the chimney to the appliance (see Figure 6)
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EN 1806:2006 (E)
Figure 2 — Examples of angle flue block
3.5
family
group of products for which the test for one or more characteristics from any one product within the family are valid
for all other products within the family
3.6
flue blocks with attached insulation
flue blocks with insulation factory-fitted to the outer walls (see Figure 5).
Figure 3 — Examples of transfer flue blocks
3.7
flue blocks with insulation in vertical perforations
flue blocks with perforations within the wall specially designed to house rigid insulation (see Figure 4).
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EN 1806:2006 (E)
Figure 4 — Example of flue block with insulation in vertical perforations
3.8
nominal height
numerical designation of the height in millimetres of a standard flue block excluding any projecting spigot, which is
a convenient round number
NOTE For a bonding flue block, this is the co-ordinating height which equates to the nominal height of masonry building
blocks for walls into which such a flue block is designed to be built.
Figure 5 — Example of flue block with attached insulation
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EN 1806:2006 (E)
3.9
nominal size
numerical designation of size which is a convenient round number equal to or approximately equal to either:
 the internal diameter in millimetres of flue blocks with circular section flue; or
 the internal width in millimetres of flue blocks with square section flue; or
 the internal width and breadth in millimetres of the internal transverse dimensions of flue blocks with
rectangular section flue.
Figure 6 — Example of entry flue block
3.10
non-bonding flue block
flue blocks designed not to be built into a masonry wall with a bonding extension
3.11
straight flue block
flue blocks designed to be used in a vertical section of a chimney having the ends perpendicular to the axis of the
flue (see Figure 1).
3.12
transfer flue block
flue block which changes the cross-section of the flue from rectangular to circular (see Figure 3).
4 Types of flue blocks

Clay/ceramic flue blocks shall be designated according to Clause 19.
A non-exhaustive list of abbreviated designation for clay/ceramic flue blocks, according to temperature, pressure,
sootfire resistance and condensate resistance (wet and dry conditions) is given in Table 1.
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EN 1806:2006 (E)
Table 1 — Examples of abbreviated designation for clay/ceramic flue blocks, conditions of use, air test
pressures and maximum air permeability rates after thermal testing
Type Block Temperature Negative Soot fire Wet or dry Test Maximum air
type pressure resistance condition pressure leakage rate
s
working test Pa x10-3
3 -1 –2
m .s .m
°C °C
FB1 N2 Non- 600 1 000 N2 Yes Dry 20 3
bonding
FB1 N1 Non- 600 1 000 N1 Yes Dry 40 2
bonding
FB2 N2 Non- 600 700 N2 No Dry 20 3
bonding
FB2 N1 Non- 600 700 N1 No Dry 40 2
bonding
FB3 N2 Non- 400 500 N2 No Dry & wet 20 3
bonding
bonding
bonding
bonding
bonding
bonding
FB6 Bonding 300 350 N2 No Dry 20 3
NOTE A flue block may be designated in one or more types provided that it complies with the appropriate requirements of
each type.
5 Materials
5.1 Flue blocks
Flue blocks shall be manufactured from suitable clay/ceramic material which, when fired, meet the performance
requirements given in this standard.
Flue blocks may be unglazed or glazed on the interior and/or exterior. When glazed, they need not be glazed on
the jointing surfaces.
5.2 Insulation
5.2.1 General
All information on reaction to fire shall be made available according to the relevant European product standard.
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EN 1806:2006 (E)
5.2.2 Shape
The insulation shall have a permanent shape (e.g. blocks or bonded loose material). It shall not comprise loose
material.
5.2.3 Thermal conductivity of insulation
The manufacturer shall declare the thermal conductivity of the insulation in accordance with the relevant European
product standard.
5.2.4 Resistance to heat
When tested in accordance with 18.8.2.3, the change in the surface temperature after the fourth cycle of heating
shall not exceed 10 % of the maximum surface temperature of the first cycle.
6 Tolerances on dimensions
6.1 Internal transverse dimensions
When tested in accordance with 18.1, the internal diameter of flue blocks with circular section flue measured on
any diameter shall not deviate more than ± 3 % of the manufacturer's stated nominal internal diameter. For flue
blocks with square and rectangular section flue, all dimensions shall not deviate more than ± 3 % of the
manufacturer's stated nominal internal length of the side. Corners of the flue may be rounded.
6.2 Height
When tested in accordance with 18.2, the height of a flue block shall not deviate more than ± 3 % of the
manufacturer's stated nominal height subject to a maximum value of 10 mm.
6.3 Angles
When tested in accordance with 18.3, the angle between the axes of a flue block and an angle flue block or
between the axes of a transfer flue block shall not be greater than 45° and shall not deviate more than ± 5º of the
manufacturer's stated nominal value.
6.4 Straightness
When tested in accordance with 18.4, the permissible deviation from straightness of straight flue blocks shall be
1 % of the test length.
6.5 Squareness of ends
When tested in accordance with 18.5, the permissible deviation from square of the ends of straight flue blocks shall
be not greater than an angle of slope 30 mm/m.
6.6 Squareness of angles and flatness of walls
When tested in accordance with 18.6, the permissible deviation from square of the angles of, and flatness of walls
for square or rectangular shape straight flue blocks, shall be not greater than 5 % of the manufacturer's stated
nominal internal width or breadth.
6.7 Joints
The design and dimensions of the joints shall be as specified by the manufacturer.
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EN 1806:2006 (E)
6.8 Bonding extension
Any bonding extension, which may be solid or contain vertical perforations, shall be designed to extend into the
adjacent masonry wall by not less than 75 mm (see Figure 1).
6.9 Tolerance on insulation thickness
The thickness of factory-fitted insulation on the outer walls of flue blocks shall not be less than the nominal value
declared by the flue block manufacturer.
7 Proof load
7.1 Straight flue blocks
When tested in accordance with 18.7, straight flue blocks shall withstand an intensity of loading of 10 MN/m2.
7.2 Angle flue blocks
Where angle flue blocks are fired in a plant alongside straight flue blocks, using the same materials and firing
process, the proof load of these angle flue blocks is deemed to be that of the straight flue blocks when tested in
accordance with 18.7.
If angle flue blocks are not normally fired alongside straight flue blocks, straight flue blocks or short lengths of
straight flue blocks made for test purposes, using the same materials and firing process as for angle flue blocks,
shall be tested for compliance with the requirements of 7.1.
7.3 Minimum load for inspection opening sections
When tested in accordance with 18.7, the minimum load shall be as given in Table 2.
Table 2 — Minimum load
Height of chimney Minimum load

m kN
H ≤ 12,5 25
12,5 < H ≤ 25 50
25 < H ≤ 50 100
For flue blocks with internal section greater than 0,04 m2 the following equation shall be used:
F = χ . H . G/ 100 (1)
where
F is the minimum load in kN;
χ is the safety factor equal to 5;
H is the height of chimney in m;
G is the weight per metre in kg/m.
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EN 1806:2006 (E)
7.4 Adhesion between outer wall and insulation
When tested in accordance with 18.14, the force required to separate the outer wall from the insulation shall be
greater than 500 N.
8 Gas tightness and thermal shock resistance
8.1 Straight flues blocks
8.1.1 General
The flue blocks shall be assembled in accordance with 18.8.2.
8.1.2 Initial gas tightness
When tested in accordance with 18.8.4, the leakage rate, before thermal shock testing, shall not be greater than
-1 -2
2 x 10-3.m3.s .m of internal surface area tested at a differential pressure of (40 ± 2) Pa.
If the permeability rate is exceeded the test flue shall be examined and the joint re-made if necessary or the flue
bocks replaced. The leakage rate shall be re-measured after further drying.
8.1.3 Thermal shock resistance
The flue blocks shall be tested in accordance with 18.8.3.
8.1.4 Final gas tightness after thermal shock testing
Flue blocks shall have a leakage rate after thermal shock testing not greater than the values given in Table 3 for
the appropriate flue block designation.
Table 3 — Pressure classes
Pressure class Maximum leakage rate Test pressure

3 -1 -2
m .s .m Pa
N1 2 x 10-3 40
N2 3 x 10-3 20
P1 0,006 x 10-3 200
P2 0,120 x 10-3 200
8.2 Angle flue blocks
Where angle flue blocks are fired in a plant alongside straight flue blocks, using the same materials and firing
process, the gas tightness and the thermal shock resistance of these angle flue blocks are deemed to be those of
the straight flue blocks.
If angle flue blocks are not normally fired alongside straight flue blocks, straight flue blocks or short lengths of
straight flue blocks made for test purposes, using the same materials and firing process as for angle flue blocks,
shall be tested for compliance with the requirements of 8.1.
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EN 1806:2006 (E)
9 Condensate resistance
When tested in accordance with 18.13, straight flue blocks (for flue blocks operating in wet conditions) shall not
allow more than 2,0 g of water per hour per m2 to pass through the internal surface of the test assembly and shall
be designated W according to Clause 4.4 of EN 1443:2003 (e.g. FB3, FB4, FB5, etc.).
Flue blocks which do not pass the test and those which are not tested shall be designated D (e.g. FB1, FB2,
FB6 etc.).
10 Corrosion resistance
When tested in accordance with 18.9, the mass loss from any test piece shall not exceed 2 % for flue blocks
designated condensate resistant (W, e.g. FB3, FB4, FB5 etc.) and 5 % for flue blocks working under dry conditions
(designated D, e.g. FB1, FB2, FB6 etc.), the flue blocks shall be designated 3 as given in Table 2 of EN 1443:2003.
Table 4 — Corrosion resistant classes
Corrosion 1 2 3
resistance
class possible fuel types possible fuel types possible fuel types
Gas : sulphur-content
3 Gas Gas
- gas ≤ 50 mg/m ,
natural gas L + H natural gas L+H natural gas L + H
Kerosene : Oil : sulphur-content ≤ 0,2 % Oil : sulphur-content > 0,2 %
- liquid sulphur-content kerosene: sulphur-content Kerosene : sulphur-content
3 3 3
≤ 50 mg/m ≥ 50 mg/m ≥ 50 mg/m
Wood in open fire places
- wood - Wood in open fire places
Wood in closed stoves
- coal - - Coal
- peat - - Peat
NOTE Class 3 is better than class 2 which is better than class 1.
11 Water absorption and bulk density
11.1 General
The flue block body shall be tested for either water absorption or bulk density for production control.
11.2 Water absorption
When tested in accordance with 18.10, the mean water absorption of five test specimens from new production of
flue blocks shall not vary more than ± 2,5 from the mean value obtained from the last type test.
11.3 Bulk density
When tested in accordance with 18.11, the mean bulk density of five test specimens from new production of flue
blocks shall not vary more than ± 100 kg/m3 from the mean value obtained from the last type test.
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EN 1806:2006 (E)
12 Abrasion resistance
When tested in accordance with 18.12, the mass of any material dislodged shall not exceed 0,03 kg/m2 of the total
exposed area of the inner surface of the flue.
13 Flow resistance
The mean roughness of flue blocks is 0,0015 m according to EN 13384-1. Other values may be declared and shall
be determined in accordance with Annex A.
14 Thermal resistance
The values of thermal resistance of flue blocks shall be declared in accordance with Annex B.
15 Resistance to fire
15.1 Internal to external
15.1.1 Testing at normal operating conditions
The flue block which forms part of a multi-wall chimney shall not be tested for the distance to combustible materials.
The flue block that forms a chimney shall be tested for the distance to combustible materials. For the latter, the
distance to combustible material shall be declared in accordance with 18.8. The manufacturer may declare a
distance to combustible material that reflects installation practice in individual member states' regulations. The
surface temperature of the combustible material shall be equal to or less than 85 °C for an ambient air temperature
of 20 °C.
15.1.2 Soot fire test
The flue block which forms part of a multi-wall chimney shall not be tested for the distance to combustible materials.
The flue block that forms a chimney shall be tested for the distance to combustible materials. For the latter, the
distance to combustible material shall be declared in accordance with 18.8. The manufacturer may declare a
distance to combustible material that reflects installation practice in individual member states' regulations. The
surface temperature of the combustible material shall be equal to or less than 100 °C for an ambient air
temperature of 20 °C.
NOTE This distance should not be less than the distance under normal operating conditions.
15.2 External to external
For complete chimneys which convey products of combustion to the atmosphere, the resistance to fire external to
external shall be evaluated according to the provision valid in the intended place of use of the flue blocks until a
European test method is available.
16 Resistance to freeze/thaw
When subject to regulation, the freeze/thaw resistance of the flue block shall be tested according to EN 14297. The
product shall not present any damage of type 7, 8, 9 and 10 in accordance with EN 14297:2004, Table 1.
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EN 1806:2006 (E)
17 Evaluation of conformity
17.1 General
The conformity of the flue blocks to the requirements of this standard and with the stated values (including classes)
shall be demonstrated by:
 initial type testing;
 factory production control by the manufacturer, including product assessment.
For the purposes of testing, the flue blocks may be grouped into families, where it is considered that the selected
property/properties is/are common to all the flue blocks within that family.
17.2 Initial type testing
Type tests relating to material composition shall be performed initially together with factory production control tests
as given in Table 5. One test shall be carried for each requirement.
All thermal testing shall be carried out on one size of flue blocks for each geometrical configuration, e.g. circular,
square, rectangular. For circulars flue blocks the size to be tested shall be 200 mm internal diameter or the closest
available internal diameter from the product range. For other geometric configurations the flue blocks shall have an
equivalent hydraulic diameter.
When a change is made either in material composition, processing technique or to the design of the flue block, the
initial type tests shall be carried out.
17.3 Further tests
They may be performed more frequently by incorporation into a plant for monitoring the consistency of manufacture
and in particular the characteristics subject to the initial type testing.
17.4 Factory production control
To achieve compliance with this standard the manufacturer shall establish and maintain an effective documented
quality system.
Factory production control tests are carried out following manufacture to monitor the quality of product (see
Table 5).
Table 5 — Initial type tests and factory production control
Relevant requirements clauses

Initial type testing Factory production control
Item
17.2 17.4
Straight flue blocks 7.1,8, 9, 10, 13,12, 14, 15 and 16 6.1, 6.2, 6.4, 6.5, 6.6 and 11
Angle blocks 7.2, 8.2, 10 and 16 6.1, 6.3, and 11
Sampling and testing of any batch shall be completed prior to removal from the works and shall be in accordance
with ISO 2859-1 at an AQL of 10 % and inspection level S2. Isolated batches of units shall be assessed in
accordance with tightened inspection procedures, with a maximum batch size of 1 200 (see Annex C).
Batches rejected under the sampling procedure specified above may be resubmitted once, after removal of units
with previously undetected visible defects, under the tightened inspection procedures, in respect only of the defect
that caused initial rejection.
17
EN 1806:2006 (E)
NOTE A quality system assessed by a certification body which complies with the requirements of EN 45012 can be applied
to ensure that the requirements of EN ISO 9001 and Clause 17 are complied with.
18 Test methods
18.1 Internal transverse dimensions
For flue blocks with square or rectangular section flue the maximum and minimum width/breadth shall be those
calculated from the tolerances given in 6.1.
For flue blocks with circular section flue, the maximum and minimum diameters shall be those calculated from the
tolerances given in 6.1.
The test may be carried out using two gauges whose diameters are set at the minimum and maximum diameters.
The minimum gauge shall be able to be turned through 360° within the ends of the flue. The maximum gauge shall
not be able to enter the flue when tested through a rotation of 360°.
Both ends of the flue blocks shall be measured.
18.2 Height
The maximum and minimum internal heights of a clay/ceramic flue block shall be those calculated from the
tolerances given in 6.2. If direct measurement is to be carried out, take two measurements at the maximum and
minimum heights.
The test also may be carried out by using two gauges whose heights are set at the minimum and maximum internal
heights. The minimum gauges shall be not able to fit over the internal height of the flue block. The maximum gauge
shall be able to fit over the internal height of the flue block.
18.3 Angles
The maximum and minimum angles between the axises of the flue block and the angle flue block or between the
axes of the transfer flue block shall be those calculated from the tolerances given in 6.3. Direct measurement of the
angles shall be carried out.
18.4 Straightness
The deviation from straightness of a flue block is the maximum distance from the centre of a straight line equal to
the test length spanning any concave curve on the outside of the flue block to the flue block surface (D) as shown
in Figure 7. It is permissible to test for straightness using any suitable apparatus.
The test length shall be 50 mm less than the nominal height of the flue block to allow for clearance at the shoulder
of any socket.
18
EN 1806:2006 (E)
Key
H Nominal height of the flue block in mm
L Test length of the flue block in mm
D Deviation from straightness in mm
H - L = 50 mm
Figure 7 — Terms for deviation from straightness
18.5 Squareness of ends
18.5.1 Gauge test
The test gauge as shown in Figure 8 with one arm set at a slope of 30 mm/m to the other shall be provided with two
pairs of supports at (50 ± 5) mm centres. The end support shall be positioned so that there is a recess of at least
30 mm from the inside of the angled arm. The slope of the supports shall be such as to provide a clearance of at
least 5 mm under the test gauge. The angled arm shall be of such a length as to span the outside diameter/width of
the flue block.
The gauge shall be placed on the end of the flue block, at the line of the longest external measurement of the flue
block. The slope of the end shall be checked against that of the gauge.
19
EN 1806:2006 (E)
Dimensions in millimetres
Figure 8 — Squareness test for ends
Key
1 30 mm/m slope
a Longitudinal section of gauge
b Cross-section of gauge
c Flue block passing test
d Flue block failing test
18.5.2 Direct measurement test
The flue block shall be placed upright on the flat plate.
A set square shall be applied on the outside of the flue block, at the inferior extremity (see Figure 9).
The horizontal distance (d) shall be measured at an accuracy of ± 0,5 mm.
The slope is given by the formula:
Slope = 1 000 d/H (mm/m) (2)
H is the height of the flue block in millimetres.
Repeat the measurement with the flue block on the other side.
20
EN 1806:2006 (E)
NOTE The joint section does not have to be taken into account.
Figure 9 — Squareness test for ends
Key
d Horizontal distance in mm
H Height of the flue block in mm
1 Flue block
2 Set square
18.6 Squareness of angles and flatness of walls
The test gauge shall be as shown in Figure 10 with one arm set at an angle of (90 ± 0,5)° to the other and both
arms of the test gauge of such a length as to span the outside width of the flue block under test.
Key
X1 Deviation from flatness of the wall in mm
X2 Deviation from squareness of the wall in mm
Figure 10 — Squareness test for angles and flatness of walls
21
EN 1806:2006 (E)
The gauge shall be placed against two adjoining walls of square or rectangular straight flue blocks and the
distances X1 and X2 measured between the inner edge of the test gauge and the outside of the flue block,
excluding the rounded external corners, to an accuracy of ± 0,5 mm.
The percentage deviation from flatness shall be calculated as:
X 1 × 100
(3)
LX
1
The percentage deviation from squareness shall be calculated as:
X 2 × 100
(4)
LX
2
where
Lx1 is the manufacturer's stated nominal internal length of the wall against which X1 is measured in mm
Lx2 is the manufacturer's stated nominal internal length of the wall against which X2 is measured in mm
18.7 Proof load
18.7.1 Test sample
The test specimen shall be cut from a flue block and shall not include any part of a joint. The test specimen shall
not be less than 150 mm high with flat and parallel ends on the full cross section of the flue block.
18.7.2 Testing equipment
The testing machine shall be substantial and rigid throughout so that the distribution of load will not be affected
appreciably by the deformation or yielding of any part. The machine shall be capable of applying the load at the
rate specified in 18.7.3 and its accuracy shall be verified by the means detailed in ISO 7500-1.
The bearing faces of both the thrust packers and the thrust plates shall be larger than the outside dimensions of the
flue block under test.
The thrust plates shall consist of metal, free from warping or twisting and be centrally located and of sufficient
dimensions so as not to distort under load. One thrust plate shall be free to tilt in any direction so that it may align
with the surface of its associated thrust packer.
The thrust packers shall consist of (18 ± 2) mm thick moisture resistant flooring grade chipboard according to
EN 312 which shall be flat pressed with the surface as pressed and be concentric with the thrust plates. New thrust
packers shall be used for each test.
The test specimen shall be placed in the machine so that the load is applied through its longitudinal axis.
18.7.3 Procedure
Ensure that the bearing surfaces of the machine and test specimen are clean and free from any loose particles.
Place the test specimen, together with a thrust packer at each end, between the thrust plates. Place the test
specimen in the machine so that the load is applied through its longitudinal axis.
22
EN 1806:2006 (E)
Apply the load to the test specimen without shock and increase at a maximum rate of 14 MN/m2 per minute until
the required intensity of loading as specified in 7.1 is reached.
The proof load required to produce the specified intensity of loading shall be calculated by one of the following
methods, as appropriate to the type of flue block:
i) For circular flue blocks
10,0 π  D12 − D22 

Proof load (N) =   (5)
4
where
D1 is the mean external diameter of the test piece, in millimetres;
D2 is the mean internal diameter of the test piece, in millimetres.
ii) For square flue blocks
Proof load (N) = 10,0 (W 21−W 22) (6)
where
W1 is the mean external width of the test piece (excluding rounded corners), in millimetres;
W2 is the mean internal width of the test piece (excluding rounded corners), in millimetres.
iii) For rectangular flue blocks
Proof load (N) = 10,0 (L1 x B1-L2 x B2) (7)
where
L1 is the mean external width of the cross-section of the test piece (excluding rounded corners) in mm;
B1 is the mean external breadth of the cross section of the test piece (excluding rounded corners in mm;
L2 is the mean internal width of the cross section of the test piece (excluding rounded corners) in mm;
B2 is the mean internal breadth of the cross section of the test piece (excluding rounded corners) in mm.
iv) For flue blocks with vertical perforations
Proof load (N) = 10,0 A (8)
where
A is the net cross-sectional area of flue blocks in square millimetres (i.e. measured by hydrostatic weighing).
18.8 Thermal performance tests
18.8.1 Test equipment
An example of equipment suitable for heating the flue is shown in Figure 11.
23
EN 1806:2006 (E)
Key
1 Exhaust gas canopy
2 Test flue
3 Outlet
4 Refractory collar
5 Ceramic fibre
6 Thermocouple
7 Gas burner
Figure 11 — Example of hot air generator
The box furnace should be heated by a high-velocity gas burner where combustion is essentially completed within
the burner body. The burner should be angled downwards so that the hot gases do not impinge directly onto the
exhaust port in the roof of the furnace. The burner should be fired by a gaseous fuel (natural gas, propane or
butane). The maximum rated capacity of the burner shall not be less than 150 kW.
An alternative source of heat may be used provided the same heating conditions apply.
In order to obtain the required rate of heating, construct a light-weight furnace, i.e. low thermal mass. Typically, the
internal dimensions of the box furnace are 700 mm long x 700 mm deep x 700 mm high and the box is lined with
100 mm of ceramic fibre. The burner shall be placed centrally on one side of the box furnace.
The exhaust port shall be fitted with a collar of cast refractory concrete with an opening of the same shape as the
internal cross-section of the flue.
The temperature of the products of combustion shall be measured by a Type K (Nickel-Chromium/Nickel-

Aluminium) thermocouple with an unsheathed junction located in the centre of the opening at the base of the test
flue. The gas and air supply to the burner shall be adjustable and a gauge shall be fitted to measure the volume
flow rate of air supplied.
18.8.2 Test flue
18.8.2.1 General
Prior to assembly the test specimens shall be dried to constant mass at a temperature of (110 ± 5) °C.
Construct a test flue of flue blocks to give a minimum overall height of 2 m.
24
EN 1806:2006 (E)
The joint between the test flue blocks shall be made using a mortar in accordance with the flue block
manufacturer’s instructions for the appropriate temperature class.
After construction, the test flue shall be left at ambient temperature 15 °C to 30 °C for a minimum period of 14 days
to allow the mortar to cure or in accordance with the manufacturer’s instructions for the mortars.
18.8.2.2 Resistance to fire, internal to external
Either:
a) install the test flue in a free standing manner; or
b) install the test flue as shown in Figure 12 adjacent to the combustible partition having a thermal resistance of
at least 0,04 (m2.K)/W at 100 °C at the manufacturer's declared distance to combustibles. Seal the opening
(side and top, see Figure 12), unless the manufacturer allows the gap to be ventilated.
18.8.2.3 Thermal shock resistance
The next to the last joint shall be made so that the last two flue blocks may be removed for air permeability and
abrasion tests.
The test flue shall be installed in a freestanding manner.
18.8.3 Procedure
18.8.3.1 General
Deliver completely combusted gas, according to the flow rate in Table 6 into the test flue and raise the temperature
of the gas uniformly to the appropriate test temperature (see Table 7) measured at the location determined as
described in Figure 11.
25
EN 1806:2006 (E)
Table 6 — Hot gas volume flow rates test temperature and flue diameter
3
A. Thermal performance – negative pressure chimneys (volume flow in m /h ± 10 %)
Maintain the hot gas temperature at (0 + 10) % of the test temperature up to 500 °C and (0 + 50) °C for higher temperatures
Diameter (1) Test temperature °C
mm 100 120 150 170 190 250 300 350 500 550 700 1 000
80 42,1 42,9 43,9 45,1 46,3 50,2 53,7 57,2 67,4 68,2 80,6 97,9
100 65,8 66,9 68,5 70,4 72,3 78,5 83,9 89,3 105 110 126 153
125 102 104 107 110 113 123 132 140 164 172 197 239
150 148 150 154 159 163 177 189 201 237 238 283 344
175 201 205 210 216 221 240 257 274 322 338 386 468
200 263 266 274 282 289 314 337 357 421 439 504 612
3
B. Thermal performance – positive pressure chimneys (volume flow m /h ± 10 %)
Maintain the hot gas temperature at (0 + 10) % of the test temperature up to 500 °C and (0 + 50) °C for the higher temperatures
Diameter (1) Test temperature °C
mm 100 120 150 170 190 250 300 350 500 550 700
50 22,0 22,8 24,0 25,0 26,0 28,0 30,0 32,0 37,0 38,8 44,1
80 64,0 66,0 69,0 72,0 74,0 80,0 85,5 91,0 107 112 126
100 105 109 115 119 122 133 142 151 177 185 209
125 174 180 189 196 202 220 235 249 292 305 345
150 262 271 285 295 304 331 353 375 440 460 520
175 370 383 404 417 430 468 500 531 622 651 736
200 500 518 545 564 580 632 675 717 840 879 994
NOTE The flow rates are for heat generation from natural gas combustion.
(1) For square and rectangular section, the diameter is calculated by the following calculation:
2⋅W ⋅ L
Dh =
W +L
where
Dh is the hydraulic diameter in mm
W is the width in mm;

L is the length in mm.
18.8.3.2 Resistance to fire, internal to external
For the test assembly described in 18.8.2.2.a) the points of measurement shall be on the exposed faces of the test
sample at the mid point of a complete flue block near the centre of the test flue or at least 100 mm from a joint. For
rectangular sections the measurement shall be taken at the mid point of the longer side.
For the test assembly described in 18.8.2.2.b) additional points of measurement shall be on the faces of the
combustible partition at a location opposite to the mid point of the test flue.
18.8.3.2.1 Normal operating condition
The temperature of the gas shall be raised at the appropriate test temperature (see Table 7) within (10 ± 1) min
then maintained until the temperature at any of the specified points of measurement does not rise by more than 2 K
in 30 min (equilibrium) or to a maximum time of 4 h.
Determine the maximum temperature at the points of measurement for an ambient air temperature of 20 °C.
26
EN 1806:2006 (E)
Table 7 — Test temperature
Temperature
T080 T100 T120 T140 T160 T200 T250 T300 T400 T450 T600
class
Test
temperature 100 120 150 170 190 250 300 350 500 550 700
°C
18.8.3.2.2 Soot fire condition
The thermal test under normal operating conditions shall be carried out before the following test, when relevant.
+50
The temperature of the gas shall be raised at 1000 °C ( ) °C within (10 ± 1) min then maintained for a period of
0
(30 ± 1) min.
Determine the maximum temperature of the points of measurement for an ambient air temperature of 20 °C.
27
EN 1806:2006 (E)
Key
1 Location of the hot gas thermocouple
2 Flue blocks
3 Partition
4 Hot gas temperature measurement point
5 Seal
⊗ Partition temperature
X Outer wall temperature
Figure 12 — Example of test assembly
28
EN 1806:2006 (E)
18.8.3.3 Thermal shock resistance
The temperature of the gas shall be raised at the appropriate test temperature according to the flue block
designation (see Table 8) then maintained for a period of 30 min.
After heating, the test flue shall be allowed to cool to room temperature without forced ventilation and with the
thermal insulation retained in position.
Table 8 — Test temperature and time to test temperature
Time to reach the

Temperature Test test temperature
class temperature from start of
heating
°C min ± 10 %
Soot fire
1 000 10
resistant (G)
T600 700 7
T450 550 5,5
T400 500 5
T300 350 3,5
T250 300 3
T200 250 2,5
T160 190 1,9
T140 170 1,7
T120 150 1,5
T100 120 1,2
T80 100 1
18.8.4 Measurement of permeability rate
For permeability testing before and after subjecting the test flue to a thermal shock test, a fan or other device
capable of producing at least the required differential pressure, a flow meter and a manometer shall be used.
When the flue has cooled, after thermal shock testing, determine the permeability at the differential pressure given
in Table 3 as appropriate to the type of flue block.
The test flue shall be sealed and the flue connected to a suitable fan or other device. The delivery of air at ambient
temperature 15 °C to 30 °C from the fan shall be controlled to maintain the required differential pressure measured
in the flue. The volume of air being delivered to the flue over one minute shall be measured and the permeability
rate calculated in terms of m2 internal surface area of test flue.
18.8.4.1.1 Expression of results

2
The permeability rate at the specified test pressure shall be expressed in terms of m3 of air per second per m of
3 -1 -2
internal cross-sectional area of test [m .s m ].
29
EN 1806:2006 (E)
18.9 Corrosion resistance test
18.9.1 Test specimens
The test specimens shall be six freshly broken pieces of flue blocks or the inner wall of a flue block with vertical
perforations about (50 x 103) mm3 ± (10 x 103) mm3 in volume free from cracks or shattered edges.
Measure first the thickness E of the test specimen (correct to ± 1,0 mm).
5 0000
E 2
The plan area of test specimen equals approximately mm (9)
50 000
The length of side for a square sided test specimen equals approximately E mm
2
(10)
EXAMPLE
Wall thickness of flue block equal to 12 mm
50 000
Plan area mm 2 = 4 167 mm 2
12
Length of side 4 167 mm ≈ 65 mm
A ventilated oven capable of maintaining a temperature of 110 °C ± 5 °C.
A balance with an accuracy of (± 0,01 g) when loaded with 200 g.
A boiling water bath.
A 2 litre beaker.
Supply of de-mineralized water.
Sulfuric acid solution, c[H2SO4] = 70 % by mass [density at 20 °C =1,610 kg/m3].
Barium chloride drops [concentration 50 g per litre].
18.9.3 Procedure
Clean the test specimens in de-mineralised water using a soft brush to remove any loose particles and dry at a
temperature of 110 °C ± 5 °C until no further loss of mass (± 0,1 g) is noted on successive weighings at 24 hour
intervals. The dry weight of the test specimen shall be recorded in grams (M1).
Place the dried test specimens in a 2 l beaker and immerse for 6 h ± 0,1 h in 1,5 l of sulfuric acid solution. Cover
the beaker with a watch glass to limit evaporation of the acid. During this time, stand the beaker in a bath of gently
boiling water.
On removal from the acid solution, place the test specimen in a beaker and wash by immersion in de-mineralised
water for 30 min, heat the water to boiling in 15 min and hold at boiling for a further 15 min.
Test for the presence of sulfate on a test-tube test specimen. Take the test specimens from the rinsing bath. Add
several drops of a barium chloride solution to the de-mineralised water at the rate of 50 g per litre.
30
EN 1806:2006 (E)
Repeat the washing cycle, changing the rinsing water after each cycle, until the water no longer becomes turbid
when a few drops of barium chloride are added or a maximum of 100 washing cycles [approximately 50 hours of
rinsing].
Wash the test specimens and dry at a temperature of 110 °C ± 5 °C until no further loss of mass (± 0,01 g) is noted
on successive weightings. Record the final dry weight of the test specimen in grams (M2).
18.9.4 Expression of results
The loss of acid soluble matter in each of the test pieces shall be calculated as a percentage of the dry mass as
follows :
Percentage loss in dry mass:
M −M
1 2
x 100 (11)
M
1
18.10 Water absorption
18.10.1 Test specimen
The test specimen shall be a test specimen of the flue block having a dry mass of between 0,25 kg and 0,4 kg.
A ventilated oven capable of maintaining a temperature of 110 °C ± 5 °C.
A balance with an accuracy of (± 0,1 g).
A boiling tank with a capacity to immerse the whole test specimen in water. The tank shall be fitted with a grid on
which to support the test specimen to ensure free circulation of water around all surfaces of the test specimen.
A desiccator containing silica gel or a more active desiccant.
18.10.3 Procedure
Dry the test specimen in a ventilated oven at a temperature of (110 ± 5) °C until no loss of mass (± 0,1 g) is noted
on successive weightings at 24 h intervals. Determine the mass in grams (W1) after cooling the test specimen to
room temperature in a desiccator containing a desiccant.
Place the dry test specimen in water at ambient temperature. Bring the water to the boil and maintain at boiling
point for one hour, immerse all the test specimen during this period. After the end of boiling, leave the test
specimen immersed in the water for a further four hours. Remove the test specimen from the tank, remove surface
water by wiping with a damp cloth and weigh the test specimen in grams immediately (W2).
The water absorption of the test specimen shall be determined as the ratio of the increase in mass of the saturated
test specimen to the mass of the dry test specimen. The ratio shall be expressed in percentage terms to the
nearest 0,1 %.
W −W
2 1
x 100 (12)
W
1
31
EN 1806:2006 (E)
18.11 Bulk density
A test specimen shall be a test specimen of the flue block having a dry mass of between 0,25 kg and 0,4 kg.
A ventilated oven capable of maintaining a temperature of (110 ± 5) °C.
A balance with an accuracy of (± 0,1 g).
A boiling tank with a capacity to immerse the whole test specimen in water. The tank shall be fitted with a grid on
which to support the test specimen to ensure circulation of water around all surfaces of the test specimen.
A bridge to be placed over the load bearing scale pan of the balance.
A container with adequate capacity to freely suspend the whole test specimen submerged in water.
A suspension thread/wire not more than 0,3 mm in diameter.
A desiccator containing silica gel or a more active desiccant.
18.11.3 Procedure
Dry the test specimen to a constant mass in a ventilated oven at a temperature of (110 ± 5) °C. Determine the
mass in grams (W 1) after cooling the test specimen to room temperature in a desiccator containing a desiccant.
Place the dry test specimen in water at ambient temperature.
Bring the water to the boil and maintain at boiling point for one hour, keep all of the test specimen immersed during
this period. After the end of boiling, leave the test specimen immersed in the water for a further four hours. Weigh
the test specimen freely suspended in water at ambient temperature (20 ± 5) °C (W2 grams).
Remove the test specimen from the water, remove surface water by wiping with a damp cloth and weigh the test
specimen immediately (W3). The difference in the two weights in grams (W3-W2) gives the volume of the test
specimen in cm3.
The dry density of the test specimen shall be determined by dividing the dry mass of the test specimen by the
volume (obtained by subtracting the mass of the test specimen when weighed under water from that when weighed
in air immediately after immersion). The dry density shall be expressed to the nearest 10 kg/m3.
W
1 3
Bulk density = x 1 000 (kg/m ) (13)
W -W
3 2
18.12 Abrasion resistance
18.12.1 Test flue
The test flue shall be as specified in 18.8.2.3 and shall have been subjected to thermal shock testing.
32
EN 1806:2006 (E)
A tight fitting metal sleeve attached to a catchment funnel shall be fitted into the top opening of the test flue. A tight
fitting metal sleeve attached to a plate which has an opening matching the area of the opening of the flue block
shall be fitted into the bottom opening of the test flue, as shown in Figure 13.
The bottom plate shall be supported directly over a collection box positioned to collect any material which is
dislodged during the test, and which is of sufficient depth to allow the brush to pass through the complete length of
the test flue.
If the test flue is to be weighed, use a balance with an accuracy of (± 1,0 g) capable of weighing two flue blocks.
The sweeping brush shall have flat spring-steel bristles of stainless steel in accordance with EN 10088-1, grade
X10 CR NI 18-8, steel number 1.4310, with a cross-section of (2,0 mm ± 0,2) mm x (0,25 ± 0,05) mm with the ends
cut square. The bristles shall be arranged so that there are 5 per 10 mm length of the perimeter of the plan area of
the brush. The brush may be a combination of single brushes.
The overall dimension of the brush shall be (25 ± 5) mm greater than the internal dimension of the flue, as shown in
Figure 14. The brush shall be held securely between plates having a plan dimension (100 ± 5) mm less than the
internal dimension of the flue.
The brush shall be attached either to a rod or to sweeping equipment.
18.12.3 Procedure
The brush shall be pushed down and up through the total length of the test sample with a maximum speed of 2 m/s
and this represents one cycle.
The flue blocks shall be conditioned by carrying out 20 brush cycles. Any material dislodged during this
conditioning phase shall be discarded. Carry out a further 80 brush cycles collecting any dislodged material.
Weigh of material dislodged from the inner surface of the test assembly and record.
Calculate the area of the inner surface of the test assembly between the steel sleeves. Calculate the loss of
material per m2.
As an alternative measurement procedure, weigh the test flue to (± 1,0 g) after 20 cycles and 100 cycles and
record the difference in mass between the two weightings to obtain the mass of material abraded during the test.
Calculate the area of the inner surface of the test assembly. Calculate the loss of material per square metre.
33
EN 1806:2006 (E)
Key
1 Height of funnel not less than 200 mm
2 Tight fitting sleeve projecting 20 to 40 mm into opening
3 Bottom plate attached to bottom sleeve
4 Height sufficient to allow brush to pass through bottom of test assembly
5 Catchment funnel attached to sleeve
6 Collection box
7 Plan of flue block opening area
8 Plan of brush area
9 Round flue block
10 Square or rectangular flue block
11 Rod
Figure 13 — Test assembly for sweeping resistance test
Dimensions in millimetres
Key
1 Brush
2 Flue block cross section: round, square, rectangular
Figure 14 — Sweeping test equipment
34
EN 1806:2006 (E)
18.13 Condensate resistance test
18.13.1 Test section
The test section shall consist of at least two flue blocks and be jointed in accordance with the manufacturer's
instructions, with a height ≥ 1,0 m. The internal dimensions shall be (140 ± 10) mm or (200 ± 20) mm or
(140 x 140 ± 10) mm or (200 x 200 ± 20) mm or the closest available internal dimensions from the product range.
One flue block may be used cut into two pieces.
18.13.2 Test apparatus
The test section shall be sealed into an airtight vessel; it shall have internal dimensions 50 mm to 60 mm greater
than external dimensions of the test specimen. The test section shall be connected to a humidity generator as
shown in Figure 15. Use a fan which will generate an air velocity of (1,0 ± 0,1) m/s and a heat generator capable of
keeping the air temperature at (55 ± 2) °C together with a water nozzle capable of vaporizing water to saturation.
Use a capillary to ensure the air pressure remains at atmospheric.
18.13.3 Procedure
Generate an airflow of 1 m/s ± 10 % with the fan. Spray water through the nozzle into the air stream. Keep the
temperature of the saturated air at the entrance of the test section at (55 ± 2) °C under a steady state.
The ambient temperature shall be (25 ± 5) °C throughout the test period.
Collect every (24 ± 0,5) h the water in the annular section between the test flue section and casing.
A steady state condition is deemed to exist when the temperature does not change more than 1 °C in 3 h and the
average of the mass of water taken from five measurements shall not vary by more than 1 g when compared with
the average of the previous five measurements.
Calculate the amount of water passing through the walls of the test flue related to the surface area in 1 h.
35
EN 1806:2006 (E)
Key
1 Flue block
2 Casing
3 Sealant
4 Condensate removal
Figure 15 — Water and vapour flow test vessel and water and vapour flow test apparatus
18.14 Adhesion test for insulation attached to outer wall of flue blocks
The test specimen shall be a flue block which has factory-fitted insulation attached. The insulation shall have been
attached at least 7 days before testing.
18.14.2 Testing procedure
The test procedure shall be as in 18.7.2.
18.14.3 Loading
Ensure that the bearing surfaces of the machine and test specimen are clean and free from any loose particles.
The test specimen shall be placed vertically on a thrust packer so that the force is only applied through the
insulation and the insulation protection. The thrust packer at the other end shall only exert force on the flue block.
This assembly shall be placed between the thrust plates. The test specimen shall be placed in the machine so that
the load is applied through its longitudinal axis.
The load shall be applied to the test specimen without shock and increased at a maximum rate of 0,014 MN/m 2 per
minute until the 500 N is reached.
36
EN 1806:2006 (E)
19 Designation
The following shall be used for the designation of flue blocks:
a) Denomination;
b) standard number;
c) nominal size;
d) temperature class;
e) pressure class N or P;
f) resistance to condensate class;
g) corrosion resistance class;
h) Thermal resistance R in m2.K/W;
i) soot fire resistance class G (followed by a distance to combustible material for flue blocks which form a
chimney) or O;
j) nominal angle of angle flue block (where applicable);
k) flow resistance.
Typical Flue EN
T600 N1 G100 D 3
example block 1806
Denomination
Standard
number
Temperature
class
Pressure class
Soot fire
resistance class
G (followed by
a distance to
combustible
material for
flue blocks
which form a
chimney) or O
Resistance to
condensate
class
Corrosion
resistance class
37
EN 1806:2006 (E)
Table 9 — Example of flue block characteristics annotated according to EN 1443 for the abbreviated
designation
Type Block Type of Negative Soot fire Dry or Wet Corrosion

chimney pressure resistance conditions resistance
FB1 N2 Non-bonding T600 N2 G D 3
FB1 N1 Non-bonding T600 N1 G D 3
FB2 N2 Non-bonding T600 N2 O D 3
FB2 N1 Non-bonding T600 N1 O D 3
FB3 N2 Non-bonding T400 N2 O D&W 3
FB6 Bonding T300 N2 O D 3
Symbols:
N negative pressure;
W wet conditions;
D dry conditions;
O without soot fire resistance;
G with soot fire resistance;
3 high corrosion resistance.
20 Marking, labelling and packaging

Flue blocks or packaging shall be marked with:
 EN 1806 (the number of this standard);
 manufacturer's identification;
 date of manufacture or batch identification.
NOTE For CE marking refer to Annex ZA.
38
EN 1806:2006 (E)
Annex A
(normative)
Measurement of the coefficient of friction of chimneys
Measurement of the coefficient of jointed flue blocks shall be done using the measuring set up shown in Figure A.1.
Key
1 Fan
2 Measuring device
3 Measuring device
4 Test tube
5 Static pressure manometer
6 Test chimney
7 Intake guide
8 Pressure manometer
Figure A.1 — Roughness measuring rig
Measuring Procedure:
Air is drawn in by a fan through the test length into a measuring pipe fixed at its end. The static pressure loss over
a stated length is measured with an accuracy of 1 Pa. The air velocity in the test length can be measured by a
measuring nozzle in terms of volume with an accuracy of + 2,5 %.
The friction coefficient is calculated following the equation:
2 × D h × ∆p
ψ= (A.1)
ρ× w× L
39
EN 1806:2006 (E)
where
ψ is the coefficient of friction;
Dh is the hydraulic diameter in m;
∆p is the pressure loss in Pa;
ρ is the density of air in kg/m3;
w is the velocity of air in m/s.
The mean roughness of the inner wall can be obtained by using the following equation:
1  2.51 τ 
= −2 log 
 +  (A.2)
ψ  Re ψ 3.71Dh 
where
Dh is the hydraulic diameter in m;
τ is the mean value of roughness of the inner wall in m;
Re is the Reynolds number;
Ψ is the coefficient of friction of the flue.
For Reynolds numbers below 2 300, take the coefficient appropriate to the Reynolds coefficient equal of 2 300.
40
EN 1806:2006 (E)
Annex B
(normative)
Thermal resistance
B.1 Method 1: simplified calculation for flue blocks without cavities

The thermal resistance shall be determined approximately in accordance with the following equations if specific
material properties and layer thicknesses are known:
a) With knowledge of the thermal resistances of the individual pipe shells
 1

R = Dh . ∑ R n .  in m2.K/W (B.1)
n
 D h, n 
b) With knowledge of the coefficients of thermal conductivity of the layers
D 
R = y∑
Dh
. ln
 h, n + 1  in m2.K/W (B.2)
n 2. λ n  D 
 h, n 
where
R is the thermal resistance of a pipe shell, referring to its internal surface in m2.K/W;
y is the coefficient of form;
y is equal to 1,0 for round and oval cross-sections;
y is equal to 1,10 for square and rectangular cross-sections up to a ratio of sides equal to or less than 1,5;
Dh is the internal hydraulic diameter in m;
Dh,n is the hydraulic diameter of the inside of each layer in m;
λn is the coefficient of thermal conductivity of the material of the layer at 200 °C in W/(m.K).
B.2 Method 2: thermal resistance of flue blocks with or without cavities
B.2.1 General
This Annex deals with the calculation of the thermal resistance of a chimney flue block made of one or several
materials using a computer program.
This calculation is based on the transformation of the heat equation in a finite difference equation.
41
EN 1806:2006 (E)
The "finite difference" form is developed for a network in the block where the dimensions are chosen according to
each type of flue block. This network is in two co-ordinated directions (x,y).
B.2.2 Data
B.2.2.1 Thermal properties of the material
Either use the thermal conductivity of the clay in two direction (x, y) given by the manufacturer or use the thermal
conductivity given in Table B.1 depending on the clay density.
Table B.1 — Thermal conductivity of the clay
Thermal
Density
conductivity
kg/m3 W/(m.K)
1 000 0,27
1 100 0,30
1 200 0,33
1 300 0,36
1 400 0,40
1 500 0,43
1 600 0,47
1 700 0,51
1 800 0,55
1 900 0,60
2 000 0,64
2 100 0,69
2 200 0,74
2 300 0,79
2 400 0,84
B.2.2.2 Boundary conditions
Key
Ti Internal temperature, i.e. flue gas temperature
hi Internal heat transfer coefficient
T1, T2 Internal surface temperature of the cavity
Figure B.1 — Boundary conditions
42
EN 1806:2006 (E)
 Internal conditions:
Ti = 200 °C
hi = 16,67 W/(m2.K)
 External conditions:
Te = 50 °C
he = 9,09 W/(m2.K)
B.2.3 Specific conditions for the cavities
B.2.3.1 General
The cavities are considered like materials with thermal equivalent characteristics. It is considered that the heat flux
transmitted by convection-conduction and the heat flux transmitted by radiation are reduced to a conduction
problem.
The thermal equivalent conductivity of the cavity is calculated by a specific computer program unconnected with the
program of the thermal resistance of the flue block.
The following notation scheme is used for the cavity:
Key
L Width of the cavity in m
H Height of the flue block in m
D Length of the cavity in m
Figure B.2 — Notation scheme used for the cavity
43
EN 1806:2006 (E)
The views ABB'A' and DCC'D' are respectively at the temperatures T1 and T2.
The views ADD'A' and BCC'B' are supposed adiabatic.
B.2.3.2 Heat transmitted by conduction-convection in the air
Φc = hc.(H.D).(T1-T2) in W (B.3)
where
hc is the convection coefficient in W/(m2.K);
hc = λair/L in conduction only for the air at 170 °C, λair = 0,0366 W/(m.K);
λair is the air thermal conductivity in W/(m.K).
The transition between conduction and convection occurs at the following value of Gr : (Grashof number):
Gr = 4007 . A4/9
for Gr > 4007 . A4/9, we will take:
−3 1/ 4
4,6⋅10 ⋅Gr
hc = (B.4)
1/9
L⋅ A
for Gr < 4007 .A4/9, we will take hc = 0,0366/L
with A = H/L and
2
Gr =
ρ ⋅g⋅ β 3
2
⋅ L ⋅ T −T
1 2
( ) (B.5)
µ
where
µ is the air dynamic viscosity (kg. m-1.s-1);
ρ is the air density kg.m-3 ;
1
β= ; (B.6)
T
β is the coefficient of thermal volumetric expansion in K-1;
g = 9,81 m.s-2;
g is the acceleration due to gravity in m.s-2;
For the air at 170 °C
Gr = 2,34 x 107. L3 (T1-T2) (B.7)
44
EN 1806:2006 (E)
B.2.3.3 Heat transmitted by radiation
Φr = hr .(H.D).(T1-T2) in W (B.8)
where
hr is the radiation coefficient in W/(m2.K);
Φr is the thermal flow transmitted by radiation in W.
3
4⋅σ ⋅T
hr = m (B.9)
 
 F 12 
2⋅1/ε − 
1+ F
 12 
where
Tm = (T1+T2)/2
Tm is the mean temperature in K;
σ is the Stefan-Boltzmann constant;
ε is the clay emissivity equal to 0,9;
F12 is the form factor of the face 1 towards face 2.
X = H/L
Y = D/L
F12 =
2
 
ln 
(
 (1+ X ² ) 1+Y 
2
)

1/ 2
+ X 1+ Y 2
tan −1 X
+ Y 1+ X 2
tan −1 Y
− X tan −1
X −Y tan −1 
Y

 (B.10)
π ⋅ X ⋅Y 2
  1+ X +Y 
2
1+ Y 2
1+ X 2 
 
B.2.3.4 Equivalent thermal conductivity
h = hc + hr (B.11)
where
h is the overall thermal transfer coefficient in W/(m2.K)
λe = h .L
where
λe is the equivalent thermal conductivity of the cavity in W/(m.K)
The equivalent thermal conductivity of a non rectangular cavity is determined to be that of a rectangular cavity
having the same area and dimension ratio, in accordance with EN ISO 6946.
45
EN 1806:2006 (E)
B.2.4 Calculations
B.2.4.1 General
The calculation is made on a cross section perpendicular to the flue gas flow.
B.2.4.2 Numerical resolution
The result of the 2D numerical calculation is the heat flux (Φ) in Watt per meter of the height flue block
Φ
Ui = (B.12)
(Ti − Te )⋅ pi
where
Ui is the internal thermal transmission coefficient in W/(m2.K);
pi is the internal perimeter of the flue block in m.
1 1 1 p 
Ri = − − ⋅  i  (B.13)
U i hi he  p e 
Ri is the internal thermal resistance of the flue block in m2.K/W;
pe is the external perimeter of the flue block in m.
B.3 Method Approximate thermal resistance values

Table B2 gives the approximate thermal resistance values for clay/ceramic flue blocks.
Table B.2 — Thermal resistance of clay/ceramic flue blocks
Overall wall thickness R

Perforations Insulation
mm (m2.K)/W
Without up to 50 without 0,05

With 1 row up to 30 without 0,08
With 1 row from 30 to 60 without 0,12
With 2 rows from 60 without 0,2
With 1 row from 30 to 60 added 0,46
With 2 rows from 60 integrated 0,55
46
EN 1806:2006 (E)
Annex C
(normative)
Sampling procedures for an AQL of 10 % and Inspection Level S2
C.1 Acceptability determination
C.1.1 General
Single or double sampling may be used.
C.1.2 Single sampling
If the number of defectives found in the sample is equal to or less than the acceptance number, the batch shall be
accepted. If the number of defectives is equal to or greater than the rejection number, the batch shall be rejected.
When reduced inspection is in effect and the acceptance number has been exceeded, but the rejection number has
not been reached, the batch shall be accepted and normal inspection reinstated. If the rejection number has been
reached or exceeded, the batch shall be rejected and normal inspection reinstated.
C.1.3 Double sampling
The number of sample units shall be equal to the first sample size in the plan. If the number of defectives found in
the first sample is equal to or less than the first acceptance number, the batch shall be accepted. If the number of
defectives found in the first sample is equal to or greater than the first rejection number, the batch shall be rejected.
If the number of defectives found in the first sample is between the first acceptance and rejection numbers, the
second sample of the size given in the plan shall be inspected.
The number of defectives found in the first and second samples shall be accumulated. If the cumulative number of
defectives is equal to or less than the second acceptance number, the batch shall be accepted. If the cumulative
number of defectives is equal to or greater than the second rejection number, the batch shall be rejected. If this
occurs on reduced inspection, normal inspection shall be reinstated for the next batch.
When reduced inspection is in effect and, after the second sample, the acceptance number has been exceeded but
the rejection number has not yet been reached, the batch shall be accepted and normal inspection reinstated.
C.2 Normal inspection

The sample size appropriate to the batch size and the acceptance and rejection values for numbers of defectives
shall be in accordance with Table C.1. Sample units shall be selected at random.
Table C.1 — Sampling plans for normal inspection
Single sampling Double sampling

Batch size Sample Accept Reject First Accept Reject Second Accept Reject
size number number sample number number sample number number
size size
2 to 1 200 5 1 2 3 0 2 3 1 2
1 201 to 20 000 8 2 3 5 0 3 5 3 4
47
EN 1806:2006 (E)
SAMPLING PROCEDURES
Summary of sampling procedures (continuous batches)
SAMPLE AND SENTENCE FIRST 10 BATCHES
AT 10 % NORMAL S2
Any single batch failures 10 successive batches pass and total

number of defectives is equal to or
less than the applicable number
RESUBMIT, IF APPROPRIATE, SWITCH TO 10 % REDUCED

AS AN ISOLATED BATCH AT S2
Any single batch failures
2 batch failures in any Any significant break
successive 5 or less in production
SWITCH TO 10 % TIGHTENED
AT S2
More than 10 batches 5 successive batches
on Tightened passed on Tightened
DISCONTINUE INSPECTION
PENDING CORRECTION
48
EN 1806:2006 (E)
C.3 Normal to reduced inspection

A reduced inspection level as shown in Table C.2 shall be used when normal inspection is in effect, provided that
the following conditions are satisfied.
a) The preceding ten batches have been on normal inspection, and none has been rejected on original
inspection;
b) the total number of defectives in the samples from the ten preceding batches (or such other number required
by Table A3) is equal to or less than the limit number given in Table C.3.
When double sampling is in use, all samples inspected should be included, not first samples only.
Table C.2 — Sampling plans for reduced inspection
Batch size Single sampling Double sampling

Sample Accept Reject First Accept Reject Second Accept Reject
size size
2 to 1 200 2 0 2 not applicable
1 201 to 20 000 3 1 3 2 0 3 2 0 4
Table C.3 — Limit number of defectives for normal to reduced inspection
Number of samples from last Limit number of defectives

10 batches
20 to 29 0
30 to 49 0
50 to 79 2
80 to 129 4
C.4 Reduced to normal inspection

When reduced inspection is in effect, normal inspection shall be reinstated if a batch is rejected, or if a batch is
accepted without either acceptance or rejection criteria having been made (see C.1.1 and C.1.2).
C.5 Tightened inspection

Tightened inspection as shown in Table C4 shall be used either when inspecting a new product or when two or
more batches have been rejected in any five consecutive batches of normal inspection or for inspecting a batch
which has previously been rejected after removal of units with previously undetected visible defects.
Table C.4 — Sampling plans for tightened inspection
Batch size Single sampling Double sampling

Sample Accept Reject First Accept Reject Second Accept Reject
size size
8 to 20 000 8 1 2 5 0 2 5 1 2
49
EN 1806:2006 (E)
C.6 Tightened to normal inspection

Tightened inspection shall continue until five consecutive batches are accepted when normal inspection shall be
resumed.
C.7 Discontinuation of inspection

If ten consecutive batches remain on tightened inspection, the provision of these sampling plans shall be
discontinued pending action to improve the quality of the submitted batches.
50
EN 1806:2006 (E)
Annex ZA
(informative)
Clauses of this European Standard addressing the provisions of EU

Construction Products Directives
ZA.1 Scope and relevant characteristics

This European Standard has been prepared under the mandate M/105 “Chimneys”, as amended, given to CEN by
the European Commission and the European Free Trade Association.
The clauses of this European standard shown in this Annex meet the requirements of the Mandate M/105
“Chimneys”, as amended, given under the EU Construction Products Directive (89/106/EEC).
Compliance with these clauses confers a presumption of fitness of the flue blocks and fittings covered by this
European standard for their intended use indicated herein; reference shall be made to the information
accompanying the CE marking.
WARNING — Other requirements and other EU Directives, not affecting the fitness for intended use, can be
applicable to the clay/ceramic flue blocks falling within the scope of this European Standard.
NOTE 1 [1] In addition to any specific clauses relating to dangerous substances contained in this standard, there may be other
requirements applicable to the products falling within its scope (e.g. transposed European legislation and national laws,
regulations and administrative provisions). In order to meet the provisions of the EU Construction Products Directive, these
requirements need also to be complied with, when and where they apply.
NOTE 2 An informative database of European and national provisions on dangerous substances is available at the
Construction web site on EUROPA (accessed through http://europa.eu.int/comm/enterprise/construction/internal/
dangsub/dangmain.htm).
This Annex establishes the conditions for the CE marking of the clay/ceramic flue blocks intended for the uses
indicated in Table ZA.1.1 and Table ZA.1.2 and shows the relevant clauses applicable.
This Annex has the same scope as Clause 1 of this standard and is defined by Table ZA.1.1 and Table ZA.1.2.
51
EN 1806:2006 (E)
Table ZA.1.1 — Relevant clauses for flue blocks with or without inspection openings to be used as part of a
multi wall chimney which convey products of combustion to the atmosphere
Construction product : Flue block with or without inspection openings covered in Clause 1 of this standard
Intended use : Part of a multi wall chimney which conveys products of combustion to the atmosphere
Essential characteristic Requirement Levels Notes

clauses in this and/or
standard classes
Resistance to fire internal to 8 Gas tightness G
external and thermal
shock
resistance
Gas tightness/leakage 8 Gas tightness None Declared pressure class
and thermal
shock
resistance
Flow resistance 13 Flow None Declared mean roughness in meter
resistance
Thermal resistance 14 Thermal None Declared value
resistance
Thermal shock resistance 8 Gas tightness None Declared temperature class
and thermal
shock
resistance
Durability against 9 Condensate None Declared condensate class
chemicals/corrosion resistance
Durability against chemicals 10 Corrosion None Declared corrosion resistance class
resistance
Compressive strength 7 Proof load None Pass/fail criteria
Durability : resistance to 16 Freeze/thaw None Pass/fail criteria
freeze/thaw resistance
52
EN 1806:2006 (E)
Table ZA.1.2 — Relevant clauses for flue blocks with or without inspection openings to be used as
complete chimney which convey products of combustion to the atmosphere
Construction product : Flue block with or without inspection openings covered in Clause 1 of this standard
Intended use : complete chimney which conveys products of combustion to the atmosphere
Essential characteristic Requirement Levels Notes
clauses in this and/or
standard classes
Resistance to fire 15.1.2 Soot fire Gxx The declared distance xx is expressed in mm
test
8 Gas tightness
and thermal
shock
resistance
Resistance to fire external to 15 External to Declared value
external external
Gas tightness/leakage 8 Gas tightness None Declared pressure class

and thermal
shock
resistance
Flow resistance 13 Flow None Declared mean roughness in meter
resistance
Thermal resistance 14 Thermal None Declared value
resistance
Thermal shock resistance 8 Gas tightness None Declared temperature class
and thermal
shock
resistance
Durability against 9 Condensate None Declared condensate class
chemicals/corrosion resistance
Durability against chemicals 10 Corrosion None Declared corrosion resistance class
resistance
Compressive strength 7 Proof load None Pass/fail criteria
Durability : resistance to 16 Freeze/thaw None Pass/fail criteria
freeze/thaw resistance
The requirement of a certain characteristic is not applicable in those Member States (MSs) where there are no
regulatory requirements on that characteristic for the intended use of the product. In this case, manufacturers
placing their products on the market of these MSs are not obliged to determine nor declare the performance of their
products with regard to this characteristic and the option “No performance determined” (NPD) in the information
accompanying the CE marking (see Clause ZA.3) may be used. The NPD option may not be used, however, where
the characteristic is subject to a threshold level.
53
EN 1806:2006 (E)
ZA.2 Procedure of attestation of conformity of clay/ceramic flue blocks
ZA.2.1 System of attestation of conformity
The system of attestation of conformity for clay/ceramic flue blocks of chimneys indicated in Table ZA.1.1 and
Table ZA.1.2, in accordance with the decision of the Commission 95/467/EC as amended by the commission
decision 01/596/EC, as given in Annex III of the mandate M/105 ‘Chimneys’, is shown in Table ZA.2 for the
indicated intended use and relevant level or class.
Table ZA.2 — System of attestation of conformity
Level or class Attestation of

Product Intended use
(Reaction to fire) conformity system
Flue blocks Chimneys Any 2+
System 2+: See Directive 89/106/EEC (CPD) Annex III.2.(ii), First possibility, including certification of the factory
production control by an approved body on the basis of initial inspection of factory and of factory production
control as well as of continuous surveillance, assessment and approval of factory production control.
The attestation of conformity of the products in Table ZA.1.1 and Table ZA.1.2 shall be according to the
evaluation of conformity procedure indicated in Table ZA.3 resulting from application of the clauses of this or
other European Standard indicated therein.
Table ZA.3 — Assignment of evaluation of conformity tasks for flue blocks as part of a multi-wall
chimney or flue blocks forming a complete chimney
Tasks Content of the task Clauses to apply

Factory production control (F.P.C) Parameters related to all 17.4
characteristics of Table ZA.1.1 or
Table ZA.1.2
Tasks under the
Initial type testing All characteristics of Table ZA.1.1 17.2
manufacturer
or Table ZA.1.2
Further testing of samples taken at All relevant characteristics of 17.3
the factory Table ZA.1.1 or Table ZA.1.2
Certification of Initial inspection Parameters related to all 17.4
FPC by the FPC of factory and of characteristics of Table ZA.1.1 or
certification F.P.C Table ZA.1.2
body on the
basis of Continuous Parameters related to all 17.3
surveillance, characteristics of Table ZA.1.1 or 17.4
assessment and Table ZA.1.2
approval of
F.P.C
ZA.2.2 EC certificate and declaration of conformity
When compliance with this Annex is achieved, and once the notified body has drawn up the certificate
mentioned below, the manufacturer or his agent established in the EEA shall draw up and retain a declaration
of conformity, which entitles the manufacturer to affix the CE marking.
54
EN 1806:2006 (E)
This declaration shall include:
 name and address of the manufacturer, or his authorised representative established in the EEA, and the
place of production;
NOTE 1 The manufacturer may also be the person responsible for placing the product onto the EEA market, if he
takes responsibility for CE marking.
 description of the product (type, identification, use), and a copy of the information accompanying the CE
marking;
NOTE 2 Where some of the information required for the Declaration is already given in the CE marking information,
it does not need to be repeated.
 provisions to which the product conforms (i.e. Annex ZA of this EN) and a reference to the ITT report(s)
and factory production control records (if appropriate);
 particular conditions applicable to the use of the product (e.g. provisions for use under certain conditions);
 number of the accompanying factory production control certificate, and FPC records, where applicable;
 name and address of the notified laboratory(ies) [if some characteristics are tested by such a lab];
 name of, and position held by, the person empowered to sign the declaration on behalf of the
manufacturer or his authorised representative.
The declaration shall be accompanied by a factory production control certificate, drawn up by the notified body,
which shall contain, in addition to the information above, the following:
 name and address of the notified body;
 number of the factory production control certificate;
 conditions of validity of the certificate, where applicable;
 name of, and position held by, the person empowered to sign the certificate.
The above mentioned declaration and certificate shall be presented in the language or languages accepted in
the Member State in which the product is to be used.
ZA.3 CE Marking and labelling

The manufacturer or his authorised representative established within the EEA is responsible for the affixing of
the CE marking. The CE marking symbol to affix shall be in accordance with Directive 93/68/EC and shall be
shown on the flue block (or when not possible it may be on the accompanying label, the packaging or on the
accompanying commercial documents, e.g. a delivery note). The following information shall accompany the
CE marking symbol:
 identification number of the certification body;
 name or identifying mark and registered address of the manufacturer;
 last two digits of the year in which the marking is affixed;
 number of the EC Certificate of Conformity or Factory Production Control Certificate (if relevant);
 reference to this European standard;
55
EN 1806:2006 (E)
 description of the product: generic name, material, dimensions and intended use;
 information on those relevant essential characteristics listed in Table ZA.1.1 and Table ZA.1.2 which are
to be declared presented as:
 declared values and, where relevant, level or class (including "pass" for pass/fail requirements, where
necessary) to declare for each essential characteristic as indicated in “Notes” in Table ZA.1.1 and Table
ZA.1.2;
 “No performance determined” for characteristics where this is relevant;
 as an alternative, a standard designation (as define Clause 19 of this standard) which shows some or all
of the relevant characteristics (where the designation covers only some characteristics, it will be need to
be supplemented with declared values for other characteristics as above.
The “No performance determined” (NPD) option may not be used where the characteristic is subject to a
threshold level. Otherwise, the NPD option may be used when and where the characteristic, for a given
intended use, is not subject to regulatory requirements in the Member State of destination.
Figures ZA.1.1 and ZA.1.2 give examples of the information to be given on the product, packaging and/or
commercial documents.
56
EN 1806:2006 (E)
CE conformity marking consisting of the ‘CE’

symbol given in directive 93/68/EC
AnyCo Ltd, P.O. Box 21, B – 1050 Name or identifying mark and registered address
of the producer
06 Last two digits of the year in which the marking

was affixed
01234-CPD-00234 Certificate number
EN 1806 No. of European standard
Clay/ceramic flue blocks which are part of a multi-wall Description of product

chimney
T600-N1-D-3-G
and
Compressive strength…….Pass
information on regulated characteristics
Flow resistance……………0,0015 m
Thermal resistance……….0,12 (m2.K)/W
Thermal shock resistance YES
Durability : Freeze/thaw… NPD
Figure ZA.1.1 — Example of CE marking information in the accompanying documents
57
EN 1806:2006 (E)
CE conformity marking consisting of the ‘CE’

symbol given in directive 93/68/EC
AnyCo Ltd, P.O. Box 21, B – 1050 Name or identifying mark and registered address
of the producer
06 Last two digits of the year in which the marking

was affixed
01234-CPD-00234 Certificate number
EN 1806 No. of European standard
Clay/ceramic flue blocks which form a complete Description of product

chimney
T600-N1-D-3-G100
and
Resistance to fire external to external…..NPD
information on regulated characteristics
Compressive strength…….Pass
Flow resistance……………0,0015 m
Thermal resistance……….0,12 (m2.K)/W
Thermal shock resistance YES
Durability : Freeze/thaw… NPD
Figure ZA.2.2 — Example of CE marking information in the accompanying documents
In addition to any specific information relating to dangerous substances shown above, the product should also
be accompanied, when and where required and in the appropriate form, by documentation listing any other
legislation on dangerous substances for which compliance is claimed, together with any information required
by that legislation.
NOTE 1 European legislation without national derogations need not be mentioned.
NOTE 2 Affixing the CE marking symbol means, if a product is subject to more than one directive that it complies with
all applicable directives.
58
EN 1806:2006 (E)
Bibliography
[1] EN 45012, General requirements for bodies operating assessment and certification/registration of
quality systems (ISO/IEC Guide 62:1996)
[2] EN ISO 9001, Quality management systems – Requirements (ISO 9001:2000)
59
BS EN
1806:2006
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BRITISH STANDARD BS EN

The European Standard EN 1806:2006 has the status of a

ICS 91.060.40; 91.100.25

This British Standard is the official English language version of

— aid enquirers to understand the text;

— present to the responsible international/European committee any

A list of organizations represented on this committee can be obtained on

This British Standard was Amendments issued since publication

ISBN 0 580 48889 6

ICS 91.060.40; 91.100.25 Supersedes EN 1806:2000

Chimneys - Clay/ceramic flue blocks for single wall chimneys -

This European Standard was approved by CEN on 19 June 2006.

EUROPEAN COMMITTEE FOR STANDARDIZATION

Management Centre: rue de Stassart, 36 B-1050 Brussels

15.1 Internal to external ..............................................................................................................................16

20 Marking, labelling and packaging ......................................................................................................38

This document supersedes EN 1806:2000.

EN 312, Particleboards – Specifications

EN 1443:2003, Chimneys – General requirements

EN 10088-1, Stainless steels – Part 1: List of stainless steels

EN 14297:2004, Chimneys – Freeze-thaw resistance test method for chimney products

3 Terms and definitions

Bonding flue block Non-bonding flue block

Figure 1 — Examples of flue block shape

Figure 2 — Examples of angle flue block

Figure 3 — Examples of transfer flue blocks

Figure 4 — Example of flue block with insulation in vertical perforations

Figure 5 — Example of flue block with attached insulation

Figure 6 — Example of entry flue block

4 Types of flue blocks

5.1 Flue blocks

5.2.3 Thermal conductivity of insulation

5.2.4 Resistance to heat

6.1 Internal transverse dimensions

6.5 Squareness of ends

6.6 Squareness of angles and flatness of walls

6.8 Bonding extension

6.9 Tolerance on insulation thickness

7.1 Straight flue blocks

7.2 Angle flue blocks

7.3 Minimum load for inspection opening sections

Table 2 — Minimum load

Height of chimney Minimum load

F is the minimum load in kN;

χ is the safety factor equal to 5;

H is the height of chimney in m;

G is the weight per metre in kg/m.

7.4 Adhesion between outer wall and insulation

8 Gas tightness and thermal shock resistance

8.1 Straight flues blocks

The flue blocks shall be assembled in accordance with 18.8.2.

8.1.2 Initial gas tightness

8.1.3 Thermal shock resistance

The flue blocks shall be tested in accordance with 18.8.3.

8.1.4 Final gas tightness after thermal shock testing

Table 3 — Pressure classes

Pressure class Maximum leakage rate Test pressure

P1 0,006 x 10-3 200

P2 0,120 x 10-3 200