DuraPlus

Installation Instructions

All-Fuel Chimney System

®
 A MAJOR CAUSE OF VENT RELATED FIRES IS FAILURE
TO MAINTAIN REQUIRED CLEARANCES (AIR SPACES)
TO COMBUSTIBLE MATERIALS. IT IS OF THE UTMOST
IMPORTANCE THAT DURAPLUS CHIMNEY BE INSTALLED ONLY IN
ACCORDANCE WITH THESE INSTRUCTIONS.

NOTE: Dear Customer, Installer, or End User:

Read through all of these instructions before We welcome any comments regarding matters
beginning your installation. Failure to install pertaining to our DuraVent products.
as described in this instruction will void the We welcome any ideas, input or complaints
manufacturer’s warranty, and may have an and I’ll make sure that someone responds
effect on your homeowner’s insurance and directly back to you.
UL listing status. Keep these instructions for Send your emails to:
future reference. This booklet also contains customerservice@duravent.com
instructions for installing a venting system
within an existing masonry chimney, and If you are searching for tech support or product
for installations passing through a cathedral information, please call us at 800-835-4429.
ceiling. Or email us at:
techsupport@duravent.com

C A ME R A -R E A DY L OG OT Y P E – UL MA R K F OR C A NA DA A ND T HE U.S .
T hese Marks are registered by Underwriters L aboratories Inc.

LISTED
MH7399
 DuraPlus
ALL-FUEL CHIMNEY SYSTEM

For the most up-to-date installation instructions, see www.duravent.com

CONTENTS

Clearance / Permits / Applications / Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Chimney Diameter / Chimney Height / Chimney Placement . . . . . . . . . . . . . 5
Chimney Enclosure Requirements / Stove Recommendations. . . . . . . . . . .6
Step-by-Step Directions / Ceiling Supported . . . . . . . . . . . . . . . . . . . . . . . . 7
Offset Elbow Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Offset Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Extended Roof Bracket Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Roof Supported Installations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Tee Supported Installations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Masonry Fireplace Installations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Zero Clearance Fireplace Installations. . . . . . . . . . . . . . . . . . . . . . . .21
Connection from Appliance to Chimney System . . . . . . . . . . . . . . . . . . . 21
Chimney Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . 22
®

3
CLEARANCE with forced draft positive-pressure appliances.
Allow at least a 2-inch clearance between DuraPlus systems are designed to extend
DuraPlus Pipe and any combustible materials. vertically with a maximum of (2) offsets of 30°
(offset and return). DuraPlus is tested to UL
Where the chimney passes through floors, Test Proceedure 103HT, and listed under UL
joists, or ceilings, Firestop Radiation Shields, Re-examination Service Number MH7399.
Support Boxes, and Close Clearance Shields
may permit reduced clearances as established Tools You May Need
by these parts, or spacers built on to these Hammer Level
parts. The clearance (air space) between Caulking Gun
the outer chimney wall, and the inside of the Plumb Bob
Support Box, Firestop Radiation Shields, Screwdriver
and Close Clearance Shields, in the cases Tin Snips
of 7 and 8-inch diameter chimney will be less Saber or Keyhole Saw
than 2 inches. Both of these systems have Drill
been extensively tested and evaluated at
these clearances. This reduced clearance is Materials You May Need
permissible at these internal locations only. Non-hardening Waterproof Sealant
All other areas require a 2-inch minimum 8 Penny Nails
clearance. Never fill any required clearance 5/16 inch x 3 inch long Lag Screws
space with insulation or any other materials. Roofing Nails
Combustible materials include lumber plywood, 3/4 inch Galvanized Electrical Conduit (where
sheetrock, plaster and lath, furniture, curtains, the chimney extends 4 feet or more above the
electrical wiring and building insulation. Keep roof)
single wall stovepipe at least 18 inches
away from combustible materials, unless a Safety Equipment
clearance reduction system that is acceptable Dependable Ladder
to the authority having jurisdiction is used, or Eye Protection
the appliance to be installed is listed and the Proper Gloves and Shoes
instructions specify a different clearance.
INSTALLATION NOTES
PERMITS Proper planning for your DuraPlus installation
Contact your local Building Official or Fire will result in greater safety, efficiency, and
Official regarding permits, restrictions, and convenience, as well as saving time and
installation inspections in your area. money. Use only authorized DuraPlus (SDP)
listed chimney parts. You must use 100%
DuraPlus listed parts to obtain a DuraPlus
DURAPLUS APPLICATIONS
listed system. Do not mix parts or try to
Use DuraPlus with wood stoves, fireplaces,
match with other products, or use improvised
furnaces, boilers, water heaters, stoves,
solutions. Do not install damaged parts. Table
ranges, or other residential-type appliances
1 lists the authorized components, and their
fueled by oil, gas, coal, or wood. Do not use
respective Underwriter’s Laboratory Catalog

4
 TABLE 1
DURAPLUS (SDP) PARTS WITH UL CATALOG NUMBERS
UL Cat # Part UL Cat # Part
SDP-P Chimney Sections SDP-TS Tee Support Bracket
SDP-T Tee SDP-IS Insulation Shield
SDP-F Flashing SDP-FRS Firestop Radiation Shield
SDP-TF Flat Roof Flashing SDP-SC Storm Collar
SDP-S Flat Ceiling Support Box SDP-WS Wall Strap
SDP-RS Round Ceiling Support Box SDP-ES Elbow Strap
SDP-SB Square Ceiling Support Box SDP-RSA Extended Roof Bracket
SDP-WT Wall Thimble SDP-AP Anchor Plate
SDP-C Chimney Cap

Numbers. The UL Catalog Numbers will be DuraPlus may be installed up to 35 feet high.
referred to within the instructions, as an aid If a chimney is installed higher than 35 feet, a
to assembly, however for ordering, use the supporting Elbow Strap must be placed every
stock numbers shown in the Chimney Products 8 feet. If the chimney extends more than 4
Catalog. Practice good workmanship. Sloppy feet above the roof, an Extended Roof Bracket
work could jeopardize your chimney’s safety. must be used. Subtract 1-1/2 inches from
Keep electrical wiring and insulation away from each Chimney Section’s length to calculate
all chimneys and stovepipes. installed length.

CHIMNEY DIAMETER CHIMNEY PLACEMENT

Follow the appliance manufacturer’s When deciding the location of your chimney,
instructions to determine chimney diameter try to minimize the alteration and reframing of
and clearances between combustible materials structural components of the building.
and your heating appliance. Never choose a
chimney with an inside diameter smaller than
the appliance flue gas outlet. To calculate the 2 FEET MIN. ABOVE HIGHEST
chimney’s outside diameter, add 4 inches to POINT OF ROOF WITHIN
10 FEET
the inside diameter.
3 FEET MIN. 10 FEET
FROM ROOF
CHIMNEY HEIGHT PENETRATION

The National Fire Protection Association

Standard #211 states: “Chimneys shall extend
at least three feet above the highest point MINIMUM CHIMNEY HEIGHT
where it passes through the roof of a building,
and at least two feet higher than any portion Figure 1
of a building within ten feet.” (Figure 1).
5
 chimneys are located in a building more than 4
stories in height.”
Cold Climates: In cold climates, chimneys
mounted on an outside wall should
ATTIC
be enclosed. Exterior chases reduce
ATTIC INSULATION SHIELD condensation and creosote formation, and
enhance draft. Include an access door by the
Tee Cleanout Cap for chimney cleaning. See
CEILING
figure 23.
FIRESTOP RADIATION SHIELD

STOVE RECOMMENDATIONS
Follow the stove manufacturer’s instructions.
The requirements stated below pertain to
ENCLOSURE MUST HAVE
all stoves or other appliances installed with
2 INCHES CLEARANCE DuraPlus chimney systems.
BETWEEN CHIMNEY AND
WALL.
Choice: Choose a stove that is listed by a
recognized testing laboratory, is appropriate for
your needs, and is not larger than required.
FLOOR
Installation: Once the chimney system is in place,
install the stove and stovepipe as described in the
SUPPORT BOX
stove manufacturer’s instructions, maintaining all
required clearances.
Figure 2 Flues: Connect only one solid fuel appliance
per chimney. Oil-burning appliances are
CHIMNEY ENCLOSURE restricted to one appliance per chimney, as
REQUIREMENTS well.
Through Rooms: Interior chimneys shall be Operation: Follow the stove manufacturer’s
enclosed where they extend through closets, instructions and safety manual for maximum
storage areas, or habitable spaces where the efficiency and safety. Overfiring can damage
surface of the chimney could be contacted by the stove and stovepipe.
persons or combustible materials. The space Fuels: Do not burn driftwood, plastic, or
between the chimney and the enclosure shall chemically treated wood such as railroad ties.
be at least 2 inches. (Figure 2). They are corrosive to your fireplace, stovepipe
Multi-Story: The National Fire Protection and chimney. Follow the stove manufacturer’s
Association Standard #211 states: “ Factory- instructions and safety manual in regards to
built chimneys that pass through floors of fuels. Not all stoves are equipped to burn coal.
buildings requiring the protection of vertical Coal with a low sulfur content will reduce the
openings shall be enclosed with approved possibility of corrosion.
walls having a fire reistance rating of not Mobile Homes: Please read the stove
less than one hour when such chimneys are manufacturer’s instructions and safety manual
located in a building less than 4 stories in carefully. Not all stoves are listed for use in
height, and not less than 2 hours when such mobile homes.

6
STEP-BY-STEP DIRECTIONS
There are five general types of DuraPlus
installations:
1. Ceiling-supported ATTIC
2. Roof-supported
3. Tee-supported (through the wall)
4. Masonry Fireplace
5. Zero-Clearance Fireplace MINIMUM OF 2 INCHES
BELOW FINISHED CEILING

Review the step-by-step directions before

beginning your installation. 18 INCHES MINIMUM FOR
SINGLE-WALL STOVEPIPE

CEILING SUPPORTED
1. Place Appliance: Position the appliance
according to the manufacturer’s instructions.
The flue outlet collar should be placed
between the rafters or joists above, if possible.
2. Frame Support Opening: Drop a plumb
bob to the center of the appliance’s flue outlet CAP
SDP-C
and mark this center point on the ceiling. Refer FLASHING
VENTILATED
to Table 2 for specific framing and clearance STORM COLLAR
SDP-SC SDP-SC
dimensions. Mark appropriate cutting lines
around the center point. Cut a square hole in CHIMNEY SECTIONS
the ceiling for a Square Support Box, or a round SDP-P

hole for a Round Support Box. Frame a level,

square opening centered over the hole which
you have cut. (Figures 3 and 4).
14 1/2”
ATTIC INSULATION SHIELD
CEILING JOISTS SDP-IS

14 1/2”

FRAMING

SUPPORT BOX

JOISTS
FRAMED
SQUARE CEILING OPENING
SUPPORT BOX
SDP-SB OR
ROUND CEILING
2 INCHES MINIMUM SUPPORT SDP-RS
BELOW FINISHED
CEILING
Figure 3 Figure 4
7
 CAP SDP-C FLASHING
VENTILATED
STORM COLLAR SDP-SC
SDP-SC
CHIMNEY SECTIONS
SDP-P
ROUND CEILING SUPPORT
SDP-RS

ATTIC INSULATION
SHIELD SDP-IS

FIRESTOP
RADIATION SHIELD
FLAT SUPPORT BOX
SDP-IS
SDP-S
ATTIC
Figure 5
2 INCH MIN
CLEARANCE CHIMNEY SECTIONS
INSIDE OF SDP-P
SECOND STORY

ENCLOSURE

FRAMED
ENCLOSURE

MIN OF 2 INCHES
BELOW FINISHED
ROUND CEILING CEILING
SUPPORT WITH TRIM
SUPPORT BOX IN
PLATES IN PLACE
CATHEDRAL CEILING
WITH TRIM FRAME IN
PLACE SQUARE CEILING SUPPORT
WOOD SCREW (6 REQ) WOOD SCREW (8 REQ) FRAMED
BOX SDP-SB OR ROUND
OPENING
CEILING SUPPORT SDP-RS
Figure 6 Figure 7
3. Install Support: Slip the Support Box a cathedral ceiling with the “U-shaped” trim is
,(Figure 5), into the framed opening. It must also shown in Figure 6. Trim kits are available
extend at least 2 inches below the finished in brass, to enhance the appearance of the
ceiling. Level the Square Support Box and various Support Boxes and Trim Frames .
nail it to the framing using at least two 8-penny Where the chimney passes through additional
nails per side. The two Trim Frames are floors and ceilings, install Firestop Radiation
positioned as shown, and screwed through Shields. Where the chimney passes through
the ceiling and into the framing members with an attic, Firestop Radiation Shields and
(6) 1-1/4 inch long round-head wood screws. Insulation Shields must be installed.
(Figure 6). The bottom of the Round Support 4. Frame Openings: Frame openings in
must also be at least 2 inches below the each ceiling or floor above the Support Box.
finished ceiling. Trim for the Support Boxes (Figure 7). These openings are to hold the
is “U-shaped” . The trim pieces are adjusted Firestop Radiation Shields and Attic Insulation
to accommodate the Square Support Box, and Shields. Locate each opening by dropping a
screwed into the framing, using wood screws. plumb bob to the four corners of the opening
A completed Square Support Box installed in below. Maintain the minimum clearances and
8
 TABLE 2
FRAMING FOR SQUARE SUPPORT BOXES, ROUND SUPPORT BOXES AND WALL THIMBLES
SQUARE SUPPORT BOXES
Chimney inside diameter 6 INCHES 7 INCHES 8 INCHES
Framed opening inside dimensions 14 ½ x 14 ½ 14 ½ x 14 ½ 14 ½ x 14 ½

ROUND SUPPORT BOXES

Chimney inside diameter 6 INCHES 7 INCHES 8 INCHES
Framed opening inside dimensions 14 ½ x 14 ½ 14 ½ x 14 ½ 14 ½ x 14 ½

WALL THIMBLES
Chimney inside diameter 6 INCHES 7 INCHES 8 INCHES
Framed opening inside dimensions 14 ½ x 14 ½ 14 ½ x 14 ½ 14 ½ x 14 ½
FIRESTOP RADIATION SHIELD
Chimney inside diameter 6 INCHES 7 INCHES 8 INCHES
Framed opening inside dimensions 14 ½ x 14 ½ 14 ½ x 14 ½ 14 ½ x 14 ½

dimensions as specified in Table 2. If Elbows

must be used to avoid an obstruction, refer to 14 INCHES
the offset elbow installation section. ROO
F PI X
TCH
5. Cut Roof Opening: Cut an opening in the 14 INCHES 14 INCHES
LINE

roof directly above the opening below, and

at least 4 inches larger than the chimney’s
outside diameter to provide at least a 2-inch X
clearance all around the chimney. If the
installation is located between rafters that
are 16 inches on center, Close Clearance CUT PANEL’S TO
Shields (a sheet metal product fabricated by ROOF PITCH LINE

DuraVent), may be used to avoid structural

reframing. (Figure 8). The 2-inch minimum
clearance to combustibles is not required when
the chimney passes through Close Clearance Figure 8
Shields. When using Close Clearance Shields,
Ventilated Flashing must be installed. Refer to through a Firestop Radiation Shield, a ceiling,
Figure 10, which pictures both Ventilated and and into an attic. The other is a multi-story
Non-ventilated Flashing. building where the chimney passes through a
6. Install Firestop Radiation Shield: One Firestop Radiation Shield, through a ceiling,
of two possible situations exist for installing into another story, and then into an attic.
the Firestop Radiation Shield. One is a Each of these require a different configuration
two- story dwelling where the chimney passes of the Firestop Radiation Shield. Figure 7
9
 FIRESTOP RADIATION SHIELD SDP-FRS illustrates the two-story building. In the case
of the two-story installation, the base of the
Firestop Radiation Shield is nailed to the top
of the framing, with the pan (the depressed
NAILS (AT LEAST 2 PER SIDE)
portion of the base), facing downwards. For
the multi-story installation, the base is nailed to
TWO-STORY GOING
INTO ATTIC
the bottom of the framing with the pan facing
FRAMING upwards. The cylindrical component of the
Firestop Radiation Shield is then slipped down
through the base from the top until it rest on
the bead. (Figure 9). Refer to Table 2 for the
FRAMING
framing requirements.
7. Assemble Chimney Sections: Lower
FIRESTOP RADIATION
SHIELD SDP-FRS and seat the female end of the first Chimney
Section in the Support Box. (Figure 11). It
will twist-lock onto the male end of a Low
MULTI-STORY GOING
NAILS (AT Profile Starter Section, which is a component
INTO NEXT FLOOR
LEAST of the Support Box. Turn Pipe Sections
2 PER
SIDE) clockwise, firmly to lock them together. Sheet
Figure 9 metal screws may be used to reinforce the
connection, however they are not normally
required. Screws are only acceptable in the
outer liner.
8. Install Attic Insulation Shield: Install
the Attic Insulation Shield where the chimney
passes into an attic. It’s purpose is to prevent
debris and insulation from getting too close to
the chimney. (Figure 12). An installed Attic
VENTILATED FLASHING Insulation Shield is 14 inches high. In attic
Figure 10 areas where this shield won’t fit, a Square
Support Box, (which is available in heights
up to 36 inches), can be used instead of an
CHIMNEY SECTION Attic Insulation Shield, provided it reaches
SDP-P
through the roof; refer to the Roof Supported
Installation section on page 14. If the
chimney is fully enclosed through the attic,
an Insulation Shield is not required, however,
again, Ventilated Flashing must be used.
Where the chimney passes into the attic,
SUPPORT BOX
SDP-S, SDP-RS, SDP-SB install the Attic Insulation Shield as follows:
a. If the Firestop Radiation Shield extends
Figure 11 above the attic floor, no modifications are

10
necessary. The Firestop Radiation Shield will WARNING: IF CHIMNEY
IS ENCLOSED IN ATTIC SDP-IS
fit inside the Attic Insulation Shield. AREA, YOU MUST USE
b. Assemble Chimney Sections until at least VENTILATED FLASHING.

18 inches of chimney extends above the

Firestop Radiation Shield.
c. Slip the Insulation Shield over the Chimney
and Firestop Radiation Shield until the base
sits squarely on the framed opening. (Figure
7).
d. Nail the Insulation Shield to the top of the Figure 12
framed opening with at least two 8-penny nails
per side. (Figure 12).
e. Wrap the Collar around the chimney and
fasten it loosely. Slide the Collar down to meet
the Insulation Shield. Slip the tab through the
adjacent slot and fold it back to tighten the
Collar. (Figure 13).
9. Attach Flashing: In new construction,
assemble the Chimney Sections to a point
above the roof, then slip the Flashing over
the chimney. On an existing roof, center
and install the Flashing before extending
the chimney above the roof. Allow space
to permit sliding the next Chimney Section Figure 13
up through the Flashing. Always insure the
chimney remains vertical, and that at least a
2-inch clearance to combustible materials is
PUSH COLLAR
maintained all around. Install the upper edge DOWN TO
of the Flashing under the roofing. Nail to the FLASHING AND
SEAL WITH
roof along the upper edge and the upper half 1 INCH ROOFING NON-HARDENING
NAILS ALONG TOP OF
on each side with 1-inch roofing nails. Do FLASHING
SEALANT.
(SEALANT SHOWN
not nail the lower edge of the Flashing, or the IN HEAVY LINE)
lower half of the sides. (Figure 14). Seal all
nail heads with a non-hardening waterproof STORM COLLAR
sealant. On flat or tarred and graveled roofs, SDP-SC

nail and seal the Flat Roof Flashing to the roof

on all sides with roofing compound. Do not put
screws through the Flashing into the Chimney
Pipe.
FLASHING
10. Finish Top: Apply a non-hardening SDP-F
waterproof sealant around the chimney at the SDP-TF

point where the Storm Collar will meet the Figure 14

11
 CAP chimney above the Flashing, and also along
SDP-C the vertical seam of the chimney pipe, which
is exposed to the weather. (Figures 14 and
15). Slide the Storm Collar down over the
APPLY SMALL BEAD OF NON-HARDENING
SEALANT ALONG SEAM SEAM OF CHIMNEY
chimney to the top of the Flashing. Tighten
PIPE SECTION and seal the Storm Collar against the sealant.
After installing sufficient Chimney Sections to
meet the height requirement, (Figure 1), snap
the Chimney Cap onto the top of the chimney.
The Chimney Cap can be removed for
Figure 15 chimney cleaning as described in the Chimney
Maintenance section of the instructions. Use
SPLITTER
an Extended Roof Bracket if the chimney
extends more than 4 feet above the roof.
(Figures 18, and 19) in the Extended Roof
Bracket section. If you are located in heavy
snow country, a “splitter” should be fabricated
SPLITTER
from heavy gauge sheet metal, and installed.
(Figure 16). This will route the snow around
the chimney, and protect it. This item is not
furnished by DuraVent.
11. Enclosures: Enclose chimneys where
they pass through occupied spaces, including
TOP VIEW closets. Always maintain at least a 2 inch
clearance between the chimney and any
Figure 16
combustible surface. Interior enclosures may
SDP-ES
be constructed with standard framing and
SDP-E 15º / 30º
sheathed with sheetrock or plywood. Use Wall
Straps, if necessary, to maintain a minimum of
2 inches of air space between the chimney and
combustible materials.
SDP-P
OFFSET ELBOW INSTALLATION
NOT MORE THAN 48 INCHES

Elbows are manufactured in 15° and 30°

RISE angles measured from the vertical. A 30°
Elbow is the largest that can be used in an
offset. A 30° Elbow may not be combined with
SDP-P a 15° Elbow to make a 45° offset for example.
Avoid Elbows if possible, since a totally vertical
chimney is more efficient. When Elbows
OFFSET
are necessary to avoid obstructions such as
Figure 17 rafters, ridgepoles, or joists, use no more than

12
2 pairs of Elbows (4 elbows total) in any one 2. Secure Offset: Place the Elbow Strap’s
chimney system. band around the angled portion of the top
1. Attach Elbows: Attach Elbows to Chimney Elbow, then tighten the nut and bolt until the
Sections or other Elbows by twisting clockwise clamp is firm. Wrap the Elbow Strap end
until they lock firmly. Attach one Elbow to the over an adjacent joist or rafter and secure it
Chimney Section below, and align it for the with at least two 8-penny nails. Do not add
offset. If the needed direction of the Elbow more Chimney Sections until the Elbows are
is different than the fully locked position, the supported. Be sure that the chimney remains
Elbow can be rotated to desired direction vertical. If the total length of the Chimney
and can be secured to pipe section with a Sections between the two Elbows exceeds 3
minimum of (4) sheet metal screws. Do not feet, install a second Elbow Strap around the
penetrate the inner wall. Refer to Table 3 to center of the Chimney Section(s).
determine the required offset length and attach
an appropriate length (or lengths) of Chimney
Section(s) above the Elbow. Do not exceed
the maximum lengths between the Elbows
specified in Table 3. Attach the second Elbow
above the Chimney Section to complete the
offset. (Figure 17).

TABLE 3
DURAPLUS (SDP) OFFSET CHART
SIZE 6” DIAMETER 7” DIAMETER 8” DIAMETER
Elbow Chimney Offset Rise Offset Rise Offset Rise
Degrees Section Inches Inches Inches Inches Inches Inches
15° 0” 1 1⁄2” 12” 1 3⁄4” 13 1⁄2” 1 3⁄4” 13 1⁄2”
15° 12” 4 1⁄4” 23 ½” 4 1⁄4” 20 1⁄2” 4 1⁄4” 23 1⁄2” RISE

15° 24” 7 1⁄2” 34” 7 3⁄4” 35 1⁄2” 6 3⁄4” 35 1⁄2”

15° 36” 10 1⁄2” 45 1⁄2” 10 3⁄4” 46 3⁄4” 9 1⁄2” 47”
15° 24”+24” 13 1⁄4” 55 1⁄2” 13 1⁄2” 57” 12” 57 1⁄4” OFFSET

30° 0” 3 3⁄4” 14 3⁄4” 3 3⁄4” 14 1⁄4” 3 3⁄4” 14 3⁄4”

30° 12” 9” 24” 9” 24” 9” 24”
30° 24” 15” 33 3⁄4” 15” 33 1⁄4” 14 3⁄4” 34 1⁄4”
30° 36” 21” 44” 21” 43 1⁄2” 20 1⁄2” 44 3⁄4”
30° 24”+24” 26 1⁄4” 53” 26” 52 1⁄2” 25 1⁄2” 53 3⁄4”

13
 CHIMNEY SECTION (Figures 18 and 19). Cut 2 pieces of 3/4 inch
SDP-P
thin wall galvanized steel electrical conduit,
EXTENDED (or rigid galvanized tubing) to these lengths.
ROOF The conduit is not furnished by DuraVent,
BRACKET
SDP-RSA and must be locally procured. Mount the two
Roof Brackets where the conduit meets the
60º
roof, using 6 roofing nails per bracket. Seal
the nail heads carefully with a non-hardening,
waterproof sealant.
3/4 INCH THIN-WALL
GALVANIZED ELECTRICAL 3. Attach Conduit: Flatten 1 inch and drill
CONDUIT (NOT FURNISHED) a 1/4-inch hole at each end of both pieces of
Figure 18 conduit. Bolt each conduit to the Pipe Band
and Roof Brackets with the nuts and bolts
CHIMNEY CAP SDP-C
provided.

EXTENDED ROOF BRACKET SDP-RSA

NOTE: IF
A DIMENSION ‘A’
60º IS GREATER
THAN 4-FEET,
A MINIMUM OF 2 INCHES
EXTENDED BELOW FINISHED CEILING
FOOF BRACKET
MUST BE USED.
STORM COLLAR SDP-SC 18 INCHES MINIMUM FOR
SINGLE-WALL STOVEPIPE

FLASHING SDP-F,
SDP-TF
CONSISTS OF: (1) PIPE BAND, (2) ROOF BRACKET CONNECTED
WITH 3/4 INCH THIN-WALL GALVANIZED ELECTRICAL CONDUIT. (NOT CAP
VENTILATED FLASHING
SDP-C
FURNISHED BY DURAVENT). FLATTEN ENDS AND BOLT TO PIPE BAND SDP-F
AND BRACKET. STORM COLLAR
SDP-SC
Figure 19 CHIMNEY SECTIONS
SDP-P
EXTENDED ROOF BRACKET
INSTALLATION
If the chimney extends more than 4 feet above
the roofline, an Extended Roof Bracket must
be installed at every 4-foot increment of height
ROOF
above the roofline, leaving no more than 4 feet
extending above the last pipe band.
1. Mount Pipe Band: Slip the Pipe Band
around the chimney and secure by tightening FRAMED OPENING

the nut and bolt.

PUSH SUPPORT BOX UP
2. Install Roof Brackets: Measure from the THROUGH ROOF, TRIM
AND FOLD BACK EXCESS
Pipe Band to the points where the conduit will SQUARE CEILING SUPPORT AS SHOWN IN FIG. 22
BOX SDP-SB
meet the roof, and form approximately a 60°
Figure 20
angle with the chimney, and with each other.
14
 1. Place Appliance: Place the appliance in it’s
ROOF SUPPORTED proper location, referring to the manufacturer’s
INSTALLATIONS instructions as to allowable distances from
Use only where a leveled Square Support Box combustibles, etc.
will extend at least 2 inches below the ceiling 2. Cut Openings: Cut a roof opening directly
(on the low side), while the top edge at least above the appliances’ flue outlet collar, just
covers the edge of the roof’s decking material. as in a Ceiling-Supported Installation (Steps 1
Square Support Boxes are available in 11 thru 5). If a separate ceiling and roof exists,
inch, 24 inch, and 36 inch heights. Mobile as shown in Figure 20, (Low Attic), first cut
home chimney installations are roof supported, and frame a ceiling opening as described
and use Ventilated Flashings. Do not seal in Ceiling-Supported Installations (Step 2).
openings. Refer to Table 2 for clearance and framing
specifications. If it is desired to install through
a cathedral ceiling (Figure 21), then the hole is
cut in the roof.
3. Install Support Box: Slip the Square
2 INCHES MINIMUM
Support Box into the framed opening so it
projects at least 2 inches below the finished
ceiling and rafters, and extends above the
ceiling to framing or decking materials to
which it will be nailed. Level the Support Box,
18 INCHES MINIMUM FOR
SINGLE-WALL STOVEPIPE and slit the corners to the roofline where they
extend beyond it. Bend the flaps (created
by the slitting) flush with the roof, and nail
the Support Box to the roof or framing with
at least two 8-penny nails per side. (Figure
CAP
SDP-C VENTILATED FLASHING 22). Screw the trim sections into the ceiling.
SDP-F
STORM COLLAR (Figure 6).
SDP-SC
CHIMNEY SECTIONS
SDP-P

SUPPORT BOX
SDP-SB

PUSH SUPPORT BOX UP

THROUGH ROOF, TRIM
AND FOLD BACK EXCESS
SQUARE CEILING SUPPORT
AS SHOWN IN FIG. 22
BOX SDP-SB

Figure 21 Figure 22

15
4. Complete Installation: Refer to Steps 8, PIPE
SDP-P
and 9, in the Ceiling Supported Installation PIPE SECTION
section, to complete the Roof-Supported 6-INCH OR 9-INCH
SDP-P TEE
installation. WALL THIMBLE
SDP-T 5/16 X 3” LAG
SCREWS
SDP-WT (6 REQ) NOT
FURNISHED
TEE-SUPPORTED INSTALLATIONS REMOVABLE
Tee-Supported installations are used when TRAY
(COMPONENT
passing through a wall to an outside chimney. OF SDP-TS)
The required parts and general configuration
are as shown in Figures 23, and 24. TEE CAP
1. Place Appliance: Position the appliance TEE SUPPORT
SDP-TS
COMPONENT OF
SDP-T
according to the manufacturer’s instructions. TEE CAP
2. Cut and Frame Opening: Cut (COMPONENT OF
SDP-T)
14-1/4 inch diameter holes in the inner and
outer walls. The center of these holes should Figure 24
be aligned with the center of the stove’s flue
outlet collar. For new construction, prior to
sheetrock or other covering of the wall studs is
applied, frame a square opening between the
studs, as specified in Table 2. ( Figure 25).
Should it be necessary to go through concrete, 14 1/2”
masonry, or cinder-block, a 14-1/4 inch

WARNING: ALLOW 1/2 INCH AIR

VENTILATED SPACE BETWEEN BASE
FLASHING MUST OF FLASHING OR COVER
BE USED WITH AND ENCLOSURE
ENCLOSURES. FRAMING.

FRAMED
EXTERIOR
ENCLOSURE

TYPICAL
THRU-THE-WALL 14 1/2”
TEE- SUPPORTED
INSTALLATION

ACCESS DOOR
FOR CLEANING

Figure 25

Figure 23

16
diameter hole must be cut through the wall. Tee and Chimney Section from the wall, and
3. Install Wall Thimble: Insert the black nail the Wall Thimble’s black section to the
section of the Wall Thimble into the opening studs with four 1-inch roofing nails. If the Wall
in the wall from inside the room, and align Thimble is going through a concrete wall, and
the nail holes with the studs. (Figure 26). no framing members are available to which to
Do not nail the black thimble section at this nail the black portion of the Wall Thimble to,
time. Attach the Tee to a 9-inch or 12-inch use masonry anchors to attach it. If a Tee-
Chimney Section by twisting until it is firmly Supported installation is being installed in a
locked. If the wall is less than 6 inches thick, garage, it must be enclosed. (Figure 27).
use a 9-inch Chimney Section; if the wall is 4. Seal Outside: From the outside, insert
between 6 and 9 inches thick, use a 12-inch the galvanized section of the Wall Thimble
Chimney Section. From outside the building, through the wall and into the black section.
insert the Chimney Section into the hole until If it does not reach the black section, an
the vertical part of the Tee is 2 inches away extension tube can be locally made from .018”
from the outside of the wall, and the black thick galvanized steel. Seal the flange of the
portion of the Wall Thimble and the Chimney galvanized portion of the Wall Thimble to the
Section protrude into the room at least 2 outside wall, using non-hardening waterproof
inches. IMPORTANT: In order to make a sealant, and fasten it to the wall with screws.
safe connection, the female end of the From the outside, slip the Chimney Section,
Chimney Section must fully contact the which is attached to the Tee, into the Thimble.
inside face of the Wall Thimble. Remove the NEVER INSTALL SINGLE WALL STOVEPIPE
THROUGH THE WALL THIMBLE!
8-PENNY NAILS (4) REQ
5/16 X 3” LAG 5. Install Tee Support: Remove the two
SCREWS (6 REQ)
NOT FURNISHED screws from the Tee Cleanout Cap, and detach
SHIMS TO it from the Tee. Attach the Tee Support Straps
MAINTAIN
CIRCULARITY to the base with the nuts and bolts provided.
OF THIMBLE
(2) REQ (NOT
FURNISHED,
MAY BE MADE 14 1/2” NOTE: IF SYSTEM EXITS
OF WOOD) THRU WALL INTO GARAGE, AN
ENCLOSURE ISREQUIRED.

14 1/2” VENTILATED FLASHING

2 INCHES
VIEW FROM OUTSIDE MINIMUM MUST BE USED
DURA PLUS
2 INCHES MINIMUM CHIMNEY PIPE

OUTSIDE
2 INCHES MINIMUM

ENCLOSURE

ACCESS DOOR
INTERIOR 2 INCHES MINIMUM FOR CLEANING
PORTION OF CLEARANCE TEE GARAGE
WALL THIMBLE SDP-T
SDP-WT (BLACK)
Figure 26 Figure 27

17
 a Flashing and Storm Collar as described
WALL STRAP in Steps 8, 9 and 10 for Ceiling Supported
Installations. Another option is to cut away
the overhang for a 2-inch clearance. (Figure
28). If the chimney extends more than 4 feet
above the top Wall Band, or Flashing, use an
Extended Roof.
7. Install Chase Cover. If a chase enclosure
ALLOW A MINIMUM OF
2 INCHES AIR SPACE
has been constructed, installing the chase
ON ALL SIDES cover requires some special considerations.
The chase must be ventilated at the top
and a 1/2-inch air gap must be established
between the cover, and the framed chase
top. In addition, a 1/2-inch air gap should
exist between the hole in the cover, and the
Chimney Pipe Sections. Figure 29 displays
in some detail, how these air gaps are
established with locally fabricated spacers and
covers. These are not furnished by DuraVent,
2 INCHES MINIMUM
but may be made from 28 gage or heavier
2 INCHES MINIMUM
sheet metal. Should the installer elect to use
Flat Roof Flashing, (which is a stock item), the
air spaces are still required. When installing
the Storm Collar, do not push it down all the
Figure 28
way to the cover, but allow an air space for
Use (2) 5/16 inch, 3-inch long lag screws to flow between the Chimney Pipe and the hole
attach the straps to the wall. Replace the Tee in the cover.
Cleanout Cap and screws, once the Tee is
installed. MASONRY FIREPLACE
6. Complete Chimney: Attach the Chimney INSTALLATIONS
Sections as in Step 7 of the Ceiling Supported 1. Determine Chimney Size: Use Table 4
Installation section. Secure the chimney to to determine the correct diameter chimney for
the wall with Wall Straps at 4-foot intervals your fireplace.
to maintain at least 2 inches of clearance to 2. Mount Anchor Plate: Chimneys for
combustible materials. Slip the Wall Straps masonry fireplaces begin with an Anchor Plate.
around the chimney, tighten the bolts, and Center the Anchor Plate on a brick or concrete
fasten the Wall Straps to the wall with (2) base over the masonry flue opening. Seal the
5/16-inch, 3-inch long lag screws. Snap the Anchor Plate with a high-temperature sealant,
Chimney Cap into the top of the chimney, and secure with (4) 1/4-inch masonry anchors.
once it is at the height specified in Figure 1. If (Figure 30). Be sure it is level. The Anchor
the chimney penetrates an overhang, frame Plate is available in two styles. One contains
for at least 2 inches of clearance, and install the perforated Starter Section, which is used
18
 in the event the chimney is to be enclosed.
1/2 INCH AIR SPACE ESTABLISHED
BY SPACERS
The other is a flat plate, to be used in cases
when the chimney is not enclosed.
3. Attach Chimney: Place the first Chimney
Section over the flange on the Anchor Plate
with the arrows pointing up. Drill 1/8-inch
diameter holes through the outer sleeve of the
Chimney Section which match the location of
1/2 INCH AIR SPACE
the corresponding holes in the Anchor Plate.
Secure the Chimney Section to the Anchor
Plate with #8 self-tapping sheet metal screws.
4. Finish Chimney: Install the rest as directed
FLAT ROOF FLASHING
in the Ceiling Supported Installation section,
Steps 4 through 10. Refer to Figure 1 and
12 INCH MINIMUM
Table 4 for chimney height requirements.
Always maintain at least 2 inches of clearance
to combustible materials, and enclose the
FRAMED chimney where it passes through occupied
CHASE
ENCLOSURE
areas. Use a Wall Strap for every four feet of
chimney height.
NAIL (AS REQ)

CAP
SDP-C
STORM COLLAR
(SDP-SC)

CHIMNEY PIPE
SECTION SDP-P
FLAT ROOF FLASHING
(SDP-TF)
MUST BE VENTILATED

LOW-PROFILE
STARTER SECTION
(REQUIRED IF
SPACERS LOCALLY ANCHOR PLATE CHIMNEY IS
FRABRICATED (NOT SDP-AP
CHIMNEY ENCLOSED)
FURNISHED BY DURAVENT)
SECTIONS
SDP-P
MASONRY
ANCHORS
(4) REQ (NOT
SHEET FURNISHED)
METAL
1/2 SCREWS (4)
REQ

EXISTING
HI-TEMP MASONRY
SEALANT CHIMNEY

Figure 29 Figure 30

19
 TABLE 4

20
 CHIMNEY
SECTION CONNECTION FROM APPLIANCE
TO CHIMNEY SYSTEM
1. Single Wall Stovepipe: DuraVent’s
“DuraBlack” stovepipe is recommended,
if single wall stovepipe is desired. The
SHEET
METAL connection to the ceiling support box, or
SCREWS
wall thimble is made with a DuraBlack Slip
Connector (Part# 1670, 1770, or 1870, for
6-inch, 7-inch, or 8-inch pipe, respectively).
The beaded end of the slip connector slips into
BASE PLATE the hole in the ceiling support or wall thimble.
(SDP-BP)
Align the tabs on the slip connector with the
notches in the face of the support or wall
thimble, push the connector in, and twist to
lock it in. Further instructions for assembling
ZERO-CLEARANCE FIREPLACE
the DuraBlack pipe are contained in their
shipping cartons. Remember, the minimum
Figure 31 clearance to combustibles for single wall
stovepipe is 18 inches.
2. DVL: DuraVent manufactures DVL, which
is a double-wall connector pipe, which may
be positioned within 6 inches to a combustible
ZERO-CLEARANCE FIREPLACE
wall, and within 8 inches to a combustible
INSTALLATIONS ceiling, provided the appliance installation
1. Manufacturer’s Instructions: Carefully instructions permit this distance. In order
read and comply with the manufacturer’s to join this type of connector to the ceiling
installation instructions for your fireplace. Verify support, or wall thimble, a Close Clearance
that DuraVent’s DuraPlus chimney is approved Adaptor (Part #8674, 8774, or 8874, for
for use on your fireplace. 6-inch, 7-inch, or 8-inch pipe, respectively),
2. Base Plate: Attach a Base Plate to the is required. The adaptor slips into the hole in
fireplace top with sheet metal screws. (Figure the ceiling support, or wall thimble. Align the
31). A high temperature sealant may be used tabs on the adaptor with the slots cut into the
if desired. face of the ceiling support, or wall thimble,
3. Chimney Sections: Attach a Chimney push in, and twist to lock it in place. Detailed
Section to the Base Plate by twist-locking. instructions for assembling the remainder of
4. Completion: Install the remainder as the close clearance system are included in the
instructed for a standard Ceiling-Supported shipping cartons.
installation, (less the Support Box). Always
maintain at least 2 inches of clearance to
combustibles, and enclose the chimney where
it passes through occupied areas.

21
CHIMNEY MAINTENANCE liability for damage resulting from the use of
1. Creosote and Soot: When wood is burned chemical cleaners.
slowly, it produces tar and other organic 7. In Case of Fire: If a flue fire occurs, close
vapors, which combine with expelled moisture all appliance draft openings, and call your
to produce creosote. The creosote vapors Fire Department. Do not use the chimney
condense in the relatively cool chimney flue again, until it has been inspected for possible
of a slow-burning fire. As a result, creosote damage.
residue accumulates on the flue lining. When 8. Painting: To increase chimney life, coat
ignited, this creosote makes an extremely hot all exterior metal parts, with the exception of
fire. the Chimney Cap with high temperature, rust
2. Access. Chimneys must be installed so proof paint. Wash the metal with a vinegar and
that access is provided for inspection and water solution before painting.
cleaning. 9. Creosote Formation: DuraVent assumes
3. When to Clean: The chimney should be no liability for structural damage or roof
inspected at least once every month during the contamination as the result of creosote
heating season to determine if creosote or soot formation. It is the owner’s responsibility
has built up. Check spark arrestor screens to comply with inspection and cleaning
every 2 to 4 weeks. If creosote or soot has requirements as described in these
accumulated, it should be removed to reduce instructions.
the risk of chimney fire.
4. How to Clean: Have your chimney cleaned
by a certified professional chimney sweep if
you have doubts about your ability to clean
it. Use a plastic, wood, or steel brush. Do
not use a brush that will scratch the stainless
steel liner of your chimney. Scrub the spark
arrestor with a wire brush. To remove the
Chimney Cap for cleaning, unscrew the four
screws that attach the cap’s support legs to
the cap base. The Tee Cleanout Cap can be
removed once the screws are unscrewed.
Remember to replace the cap when you are
finished cleaning the chimney.
5. Coal: To reduce corrosion in chimneys
where coal is burned, clean the chimney
thoroughly within 48 hours of shutting down
the stove for the season.
6. Chemical Cleaners: Use chemical
cleaners only as a last resort, and use only
those which the manufacturer specifically
warrants as being non-corrosive to the
chimney liner. DuraVent will assume no
22
23
DURAVENT LIMITED LIFETIME WARRANTY
DuraVent, Inc. (“DuraVent”) provides this limited lifetime warranty for all of its products with the exception of Ventinox® (lifetime), and
PolyPro® (ten years). Subject to the limitations set forth below, DuraVent warrants that its products will be free from defects in material or
manufacturing, if properly installed, maintained and used. DuraVent products are fully warranted if installed only by a professional installer.
This Warranty is transferable from the original homeowner to the buyer of the home. This warranty does not cover normal wear and tear,
smoke damage or damage caused by chimney fires, acts of God, or any product that was: (1) purchased other than from an authorized
DuraVent dealer, retailer or distributor; (2) modified or altered; (3) improperly serviced, inspected or cleaned; or (4) subject to negligence or
any use not in accordance with the installation instructions included with the product as determined by DuraVent. Installation instructions
are available online at www.duravent.com under Support/Literature and through our Customer Service Department 800-835-4429 or
customerservice@duravent.com. This limited lifetime warranty applies only to parts manufactured by DuraVent.
DuraVent provides the following warranties for its products: One Hundred Percent (100%) MSRP 15 years from the date of purchase, and Fifty
Percent (50%) thereafter, except for the following limitations on: all Termination Caps and DuraBlack® are warranted at One Hundred Percent
(100%) for five years.
All warranty obligations of DuraVent shall be limited to repair or replacement of the defective product pursuant to the terms and conditions
applicable to each product line. These remedies shall constitute DuraVent’s sole obligation and sole remedy under this warranty. This warranty
provides no cash surrender value. The terms and conditions of this warranty may not be modified, altered or waived by any action, inaction or
representation, whether oral or in writing, except upon the express, written authority of an executive officer of DuraVent.
Corn, bio-fuels, driftwood or other wood containing salt, preservative-treated lumber, plastic and household trash or garbage, or wood pellets
containing such materials must not be burned in the appliance or fireplace. In case of a chimney fire, the chimney must be inspected and
approved by a certified Chimney Sweep before reuse. After each annual inspection, maintenance, and cleaning, the certified Chimney Sweep
must fill out and date the appropriate section of the warranty card provided with the chimney liner.
LIMITATIONS ON INTERNET SALES: Notwithstanding any other terms or conditions of this Limited Lifetime Warranty, DuraVent provides no
warranty for the following specific products if such products are not installed by a qualified professional installer: DuraTech®, DuraPlus HTC®,
DuraChimney® II, PelletVent Pro®, DirectVent Pro®, FasNSeal®, FasNSeal® W2, FasNSeal® Flex, and PolyPro®, and DuraVent’s relining products
including DuraLiner®, DuraFlex® (SW, Pro, 316, 304), and Ventinox®. For purposes of this warranty, a trained professional installer is defined as
one of the following: licensed contractors with prior chimney installation experience, CSIA Certified Chimney Sweeps, NFI Certified Specialists,
or WETT Certified Professionals.
DuraVent must be notified and given the opportunity to inspect defective product prior to replacement under the terms of this limited lifetime
warranty. All warranty claims must be submitted with proof of purchase. Labor and installation costs are not covered under this warranty. To
obtain warranty service contact: DuraVent Warranty Service, 877 Cotting Ct., Vacaville CA 95688, or call 800-835-4429.
WHERE LAWFUL, DURAVENT DISCLAIMS ALL OTHER WARRANTIES, INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT WILL DURAVENT BE LIABLE FOR INCIDENTAL, CONSEQUENTIAL,
PUNITIVE OR SPECIAL DAMAGES OR DIRECT OR INDIRECT LOSS OF ANY KIND, INCLUDING BUT NOT LIMITED TO PROPERTY DAMAGE AND
PERSONAL INJURY. DURAVENT’S ENTIRE LIABILITY IS LIMITED TO THE PURCHASE PRICE OF THIS PRODUCT. SOME STATES DO NOT ALLOW
LIMITATIONS ON IMPLIED WARRANTIES, OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THE ABOVE
LIMITATIONS AND EXCLUSIONS MAY NOT APPLY TO YOU. THIS LIMITED WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, AND YOU MAY ALSO
HAVE OTHER RIGHTS THAT VARY FROM STATE TO STATE.
For the most up-to-date installation instructions, see
www. duravent.com
REV 3.22.2012
Manufactured in Vacaville CA and Albany NY

Customer Service Support: 800-835-4429 • 707-446-4740 FAX • www.duravent.com

DuraPlus is a registered trademark of DuraVent, Inc.
All rights reserved. Made in the USA. ©2012, 2017 L119_820003146_Install Instructions_DuraPlus_07-10-17_V2