Zehnder Comfotube 75Mm

Zehnder ComfoTube
75mm
ComfoTube 75mm
The Zehnder ComfoTube 75mm is a high performance semi-rigid ductwork ideal for residential applications. The low profile
manifolds and ductwork mean it’s perfect for use in small ceiling voids and is strong enough to even be set into the building
concrete structure. The clinside smooth internal lining help to reduce build up of dust and enable the ductwork to be
cleaned; this has helped the ductwork achieve a hygiene certificate from the Hygiene Institute. The ductwork’s quality has
also earned it the highly acclaimed SKZ certification, in addition to being fully accredited and listed on the PCDB.
The ductwork can be installed much faster than conventional ductwork with a reduced number of connections helping to
reduce any potential air leakage within the system. The O-rings and locking slides also help to prevent the ductwork being
disconnected during first fix and maintain an airtight seal. End caps are also provided to prevent dust ingress during first fix to
maintain a hygienic system.
A variety of manifolds, ancillaries and terminations can be used with the ductwork in addition to a wide range of designer
grilles. The ductwork can also be used with the unique modular ComfoWell manifolds with integrated attenuators and filters.
Key Features
• ■Easy and quick to install
• ■Airtight
• ■High-quality food-grade plastic (HDPE)
• ■Fully accredited and listed on the PCDB
• ■Certified by the Hygiene Institute and SKZ certified
• ■Low pressure losses
• ■Easy to clean
• ■Suitable for installation in the building concrete structure
• ■Crush resistant ring stiffness of ~12.0 kN/m2
• ■Corrosion resistant
• ■Lightweight and easy to handle
• ■No sealant or tape required
• ■Wide range of manifolds and grille terminations
• ■Suitable for use with the unique modular ComfoWell manifolds
Article Numbers
Description Product Code
Ductwork
Zehnder ComfoTube ø 75mm, 20m roll 990 328 001
Zehnder ComfoTube ø 75mm, 50m roll 990 328 002
Manifold - See ComfoWell datasheet for all modular manifold options

Plastic manifold, 1 x ø 125mm connection, 5 x ø 75mm ports TPDB1255
CLD Grille housing

Grille housing CLD-P 75 frontal sleeve, height 85mm, connects 1 x ø 75mm Zehnder ComfoTube 990 320 810
Grille housing CLD-P 75 lateral sleeve, height 85mm, connects 1 x ø 75mm Zehnder ComfoTube 990 320 811
Article Numbers
TVA Grille housing

Grille housing TVA-P 75 connects 1 x ø 125mm valve to 1 x ø 75mm Zehnder ComfoTube, L167mm 990 326 001
Lamina / Bilamina Grille housing

Rectangular grille housing, 1 x ø 75mm connection to Lamina or Bilamina 400 990 321 641
Rectangular grille housing, 2 x ø 75mm connections to Lamina or Bilamina 400 990 321 642
Rectangular grille housing, 1 x ø 75mm connection to Lamina or Bilamina 600 990 321 663
Rectangular grille housing, 2 x ø 75mm connections to Lamina or Bilamina 600 990 321 664
Rectangular grille housing, 1 x ø 90mm, 2 x ø 75mm connection to Lamina or Bilamina 400 990 321 745
Ancillaries
Zehnder ComfoTube ø 75mm, adjustable airflow regulator, 30mm length 988 320 030
Zehnder ComfoTube ø 75mm, adjustable airflow regulator, 75mm length 990 320 026
Filter for ø 125mm extract air valve, ISO Coarse >45% (G3), 10 Pieces 990 320 032
Filter for CLD housing, ISO Coarse >45% (G3), 10 Pieces 990 320 573
Zehnder ComfoFresh Flat 51 to Zehnder ComfoTube ø 75/90mm convertor 990 322 013
Zehnder ComfoTube ø 75mm, 90° bend 990 322 152
Zehnder ComfoTube ø 75/90mm cross-piece 990 322 155
Zehnder ComfoTube ø 75mm, locking slides, 10 pieces 990 326 024
Grille housing TVA-P 75/90 mounting set for concrete application 990 326 127
90° metal bracket for max 2 Zehnder ComfoTube 990 327 109
Zehnder ComfoFix link for ComfoTube ø 75mm, 10 pieces 990 327 200
Zehnder ComfoTube ø 75mm, pipe connector 990 328 107
Zehnder ComfoTube ø 75mm, end caps, 10 pieces 990 328 262
Zehnder ComfoTube ø 90mm, end caps, 10 pieces 990 328 263
Zehnder ComfoTube ø 75mm, O-ring seal, 10 pieces 990 328 362
3D System Layout
990328107
990326001
ComfoTube Ø75mm,
pipe connector Housing TVA-P, Ø125mm valve
to 1 x Ø75mm port
990328007
ComfoTube Ø75mm,
50m roll
705613126
GFB10M Comfovalve Luna S125,
Duct fixing band supply valve, Ø125mm, white
galvanised,
12mm x 10m
990327200
ComfoFix link for
ComfoTube Ø75mm, The O-ring is used to ensure an
10 pieces airtight connection is made with
pipe connectors, grille housings,
manifold/mounting plates and
990328362 connecting elements.
ComfoTube Ø75mm,
O-ring seals, 10 pieces
990328263
ComfoTube Ø90mm,
end caps, 10 pieces
990326125
Grille housing TVA-P 75
connects 1 x Ø125mm valve to
2 x Ø75mm ComfoTube, L300mm
990320630
Torino rectangular designer grille
260mm x 160mm, stainless steel
988320030
ComfoTube Ø75mm,
adjustable airflow regulator,
30mm length
The airflow regulator has 5
different restriction settings to
reduce the air volume silently.
The airflow regulator can be used
990320810 at the manifold box or at the
grille housing by inserting it into
Grille housing CLD-P75 frontal sleeve,
the ComfoTube ductwork.
height 85mm, connects 1 x Ø75mm
ComfoTube, L300mm
ComfoSwitch C
ComfoPipe Plus Ø200mm Insulated Ductwork and ComfoTube Ø75mm Semi-Rigid Ductwork
Zehnder ComfoTube ø 75mm, 20/50m roll
Article number: 990 328 001 / 990 328 007
Technical Specification
Material High-quality food-grade plastic
Outer layer: High-density polyethylene (HDPE)
Inner layer: Low-density polyethylene (LDPE)
Operating temperature range -25 to +60 °C
Maximum recommended air volume per tube 8.3l/s (30m³/h)
Minimum bending radius 75mm
Minimum radius < 2 x diameter Yes
Buoyancy in concrete 80 N/m
Outside diameter 75mm
Inside diameter 63mm
Weight per m 0.31 kg/m

Fire rating in accordance with EN 13501-1 E
Ring stiffness ~12.0 kN/m2
BS EN ISO 9969:2007 crushability compliant Yes
Coil diameter (50m roll) 1180mm
Coil height (50m roll) 390mm
Pressure Curve
Sound Data
Octave Band (Hz) Insertion Loss, dB
63 125 250 500 1000 2000 4000 8000

Zehnder ComfoTube ø 75mm, 1m length 0.4 0.6 0.4 0.2 0.3 1
Acoustic performance measured according to EN ISO 7235 (pink noise)
For use with Zehnder ComfoWell, Manifolds and Grille housings.

Plastic manifold, 1 x ø 125mm connection,
5 x ø 75mm ports
Article number: TPDB1255
Description
Manifold:
Plastic anti-static manifold. Rectangular compact Dimensions
design. Suitable for use with the Zehnder ComfoTube ø
75mm semi-rigid ductwork and comes complete with
locking slides. Side view
The mounting plate can be mounted on the top or front

of the manifold. For cleaning purposes the manifold
plate can be removed for easy access. Mounting on
the wall or ceiling is done using the premoulded fixing
holes. Front view
Height 136mm
Width 644mm
Depth 623mm
Weight 5.8 kg
Top View
Material High-density polyethylene (HDPE)
Operating temperature -10oC to +70oC
range
Pressure Curve
For use with Zehnder ComfoTube ø 75mm semi-rigid ductwork.

10 x ø 75mm ports
Article number: TPDB16010

Description
Manifold:
Plastic anti-static manifold. Rectangular compact
design. Suitable for use with the Zehnder ComfoTube ø Dimensions
75mm semi-rigid ductwork and comes complete with
locking slides.
Side view
the wall or ceiling is done using the premoulded fixing
holes.
Front view
Height 239mm
Width 642mm
Depth 626mm
Weight 8 kg
Operating temperature -10oC to +70oC
range
Top View
Pressure Curve

15 x ø 75mm ports
Article number: TPDB18015 Dimensions

Description
Manifold:
Side view
Plastic anti-static manifold. Rectangular compact
design. Suitable for use with the Zehnder ComfoTube
ø 75mm semi-rigid ductwork and comes complete with
locking slides.

the wall or ceiling is done using the premoulded fixing Front view
holes.
Height 346mm
Width 642mm
Depth 635mm
Weight 9 kg
Operating temperature -10oC to +70oC Top View
range
Pressure Curve

CLD Grille housing - Frontal Sleeve 85mm
Article number: 990 320 810
Description Dimensions
CLD Grille housing:
Rectangular frontal entry grille housing. The cleanable
rectangular CLD grille ousing is suitable for installation
in all types of wall/floor/ceiling depending on the CLD Side view
height and comes complete with locking slides.
The rectangular designer grilles (300 x 200mm and

260 x 160mm) can be surface or flush-mounted
dependent on preference. A Zehnder ComfoFresh filter
can be used to remove particulates. Front view
Height 85mm
Width 273.5mm
Depth 144mm
Weight <0.8kg
Material High-density polyethylene (HDPE) Top View
For use with Zehnder CLD Designer grilles.
CLD Designer Grilles - Lateral Sleeve 85mm
Description
CLD Grille housing: Dimensions
Rectangular lateral sleeve entry grille housing. The
cleanable rectangular CLD grille housing is suitable for
installation in all types of wall/floor/ceiling depending
on the CLD height and comes complete with locking
slides. Side view

can be used to remove particulates.
Front view
Height 85mm
Width 250mm
Depth 167.33mm
Weight <0.8kg
Top View

Description
CLD Grille housing:
Rectangular frontal entry grille housing. The cleanable Dimensions
rectangular CLD grille housing is suitable for installation
in all types of wall/floor/ceiling depending on the CLD
Side view
Height 115mm Front view
Width 277.5mm
Depth 144mm
Weight <0.8kg
For use with Zehnder CLD Designer grilles. Top View
Description
CLD Grille housing:
Rectangular lateral sleeve entry grille Dimensions
housing. The cleanable rectangular CLD grille
housing is suitable for installation in all types of
wall/floor/ceiling depending on the CLD height and
comes complete with locking slides. Side view

Width 250mm
Depth 171.5mm
Weight <0.8kg
Top View


Dimensions
Description
CLD Grille housing:
Rectangular frontal entry grille housing. The cleanable
rectangular CLD grille housing is suitable for installation
Side view
in all types of wall/floor/ceiling depending on the CLD

can be used to remove particulates. Front view
Height 140mm
Width 276.9mm
Depth 144mm Top View
Weight <0.8kg
Description
CLD Grille housing:
Dimensions
Rectangular lateral sleeve entry grille
housing. The cleanable rectangular CLD grille
wall/floor/ceiling depending on the CLD height and Side view
comes complete with locking slides.

Technical Specification Front view

Height 140mm
Width 250mm
Depth 170.9mm
Weight <0.8kg
Top View
TVA Grille housing - Grille housing TVA-P 75 connects
1 x ø 125mm valve to 1 x ø 75mm Zehnder ComfoTube
Pressure Curve
Description
Dimensions
TVA Grille housing:
Circular grille housing. The cleanable circular TVA grille
wall/ceiling depending on the height and comes
complete with locking slides. Side view
The square (160 x 160mm) and circular designer grilles

can be used in addition to any standard ø 125mm
valve. A Zehnder ComfoFresh filter can be used to
remove particulates.
Spigot 166.7mm
length
Width 160mm
Depth 188mm
Weight 0.5kg Top View
For use with TVA Designer grilles, ø 125mm supply/extract grilles and
ComfoValve Luna

64mm length

Pressure Curve
Description
TVA Grille housing:
Circular grille housing. The cleanable circular TVA grille Dimensions
wall/ceiling including set into concrete, depending on
the height, and comes complete with locking slides.
For installation into concrete the 990 326 127 mounting Side view
set is also required.

Front view
Height 147mm
Spigot 64.2mm
length
Width 174.5mm
Depth 178.4mm
Top View
Weight 0.38 kg
ComfoValve Luna
300mm length
Pressure
Article number:Curve
990 326 125
Dimensions
Description
TVA Grille housing:
Circular grille housing. The cleanable circular TVA grille
wall/ceiling depending on the height and comes com- Side view
plete with locking slides.

Height 383.5mm
Spigot 300.3mm
length
Width 174.5mm
Depth 178.4mm
Weight 0.5 kg Top View
ComfoValve Luna
Lamina / Bilamina Grille housing - Rectangular grille

housing, 1 x ø 75mm connection to Lamina or Bilamina
400mm length
Pressure Curve
Dimensions
Description
Lamina / Bilamina Grille housing:
Rectangular lateral sleeve entry grille housings. The
Side view
cleanable rectangular lamina / bilamina grille housing
is suitable for installation in all types of wall/ceiling
depending on the height and comes complete with
locking slides.
The rectangular lamina / bilamina grilles can be used

and offer adjustable directional air supply.

Height 164mm
Width 434mm
Depth 103mm
Weight 2kg
Material Galvanised Steel
For use with Lamina / Bilamina 400 rectangular grilles Top View
400
Pressure Curve
depending on the height and comes complete with Side view
locking slides.

Width 434mm
Depth 103mm
Weight 2.05kg
Material Galvanised Steel Top View
For use with Lamina / Bilamina 400 rectangular grilles

600
Pressure Curve
Description
Rectangular lateral sleeve entry grille housings. The Dimensions
locking slides. Side view

Height 164mm
Width 634mm
Depth 103mm
Weight 2.77kg
Top View

600
Pressure Curve
Dimensions
Description
Side view
locking slides.


Height 164mm
Width 634mm
Depth 103mm
Weight 2.93kg
Top View

housing, 1 x ø 90mm, 2 x ø 75mm connection to Lamina
or Bilamina 400
Pressure Curve
depending on the height and comes complete with Side view
locking slides.

Height 182mm
Front view
Width 439mm
Depth 115.4mm
Weight 1.05kg
Top View
Ancillaries - Zehnder ComfoTube ø 75mm,
adjustable airflow regulator 75 / 30 mm Length
Pressure Curve
Article number: 988 320 026 / 988 320 030
Description
Airflow regulator:
Zehnder ComfoTube adjustable airflow regulator. The
airflow regulator has 5 different restriction settings to
reduce the air volume silently. The airflow regulator can
be used at the manifold box or at the grille housing by
inserting it into the ComfoTube ductwork.
Length 75mm / 30mm
Diameter 63mm
Weight <0.04kg
Material Polypropylene
Ancillaries - Zehnder ComfoFresh filter
Pressure Curve
Article number: 990 320 032 / 990 320 573
Description
Grille housing filter:
Zehnder ComfoFresh filter for ø 125mm TVA and CLD
grille housing. The filter is perfect to remove particles
before they enter the ductwork and is quick and easy
to install without interfering with the installed parts.
990 320 032 990 320 573
Length 165mm
Diameter 125mm
Height 9mm
Width 113mm
Depth 174mm
Filter grade ISO Coarse <45% (G3)
Weight <0.018kg each
Material Polyester
For use with TVA and CLD designer grilles and ø 125mm extract grilles
Ancillaries - Zehnder ComfoFresh Flat 51 to Zehnder
ComfoTube ø 75/90mm convertor
Pressure Curve
Dimensions
Description
Zehnder ComfoFresh Flat 51 to Zehnder Side view
ComfoTube ø 75/90mm convertor:
Zehnder ComfoTube adjustable airflow regulator. The

rigid connector can be used to convert Zehnder
ComfoFresh Flat 51 to Zehnder ComfoTube ø 75 or
Zehnder ComfoTube ø 90mm and comes complete
with locking slides and O-rings.
Front view
Height 97mm
Width 167mm
Depth 145mm
Weight 0.24kg
Top View
Ancillaries - Zehnder ComfoTube ø 75mm, 90° bend

Pressure Curve
Dimensions
Description
Rigid 90° bend:
Zehnder ComfoTube ø 75mm, 90° bend. The rigid
bend can be placed between two lengths of Zehnder
ComfoTube ø 75mm or directly into the manifold /
mounting plate and comes complete with locking Side view
slides.
Height 173.8mm
Width 133.3mm
Depth 85.5mm Front view
Weight 0.18kg
Top View
Ancillaries - Zehnder ComfoTube ø 75/90mm cross-piece

Pressure Curve
Description
ComfoTube cross-piece:
Dimensions
Zehnder ComfoTube ø 75/90mm cross-piece. The
compact cross-piece can be used to cross over two
lengths of Zehnder ComfoTube ø 75mm or Zehnder
ComfoTube ø 90mm in a height restricted space. The
cross-piece comes complete with locking slides and
O-rings. Side view
Height 105mm
Width 408mm
Depth 408mm
Front view
Weight 1.2 kg
Top View
Ancillaries - Zehnder ComfoTube ø 75mm,

locking slides, 10 pieces
Pressure Curve
Description
Locking slide:
Zehnder ComfoTube ø 75mm, locking slide. The locking
slide is used to secure the Zehnder ComfoTube ø 75mm
ductwork without the need for messy sealants.
Weight 0.028kg (each)
Material Galvanised steel
For use with Zehnder ComfoTube ø 75mm ComfoWell / Grille housings

Ancillaries - Grille housing TVA-P mounting set
for concrete application
Pressure Curve
Description
Mounting set:
Grille housing TVA-P 75/90 mounting set for concrete
application. Used in conjunction with 64mm versions of
the TVA-P to ensure quick installation to wooden
framework prior to concrete being poured.
Weight 0.08kg
Material Polymer
For use with TVA-P L64mm versions
Ancillaries - 90° metal bracket for max 2 Zehnder

ComfoTube
Pressure Curve
Description
Metal bracket:
90° metal bracket for max 2 Zehnder ComfoTube. The
mounting aid is to enable a 90 degree angle to be formed
on Zehnder ComfoTube ø 75mm or Zehnder ComfoTube
ø 90mm when attached to a horizontal surface.
Height 200mm
Width 300mm
Depth 100mm
Weight 0.57kg
Material Galvanised steel
Ancillaries - Zehnder ComfoFix link for ComfoTube ø
75mm, 10 pieces
Pressure Curve
Description
Dimensions
ComfoFix mounting bracket:
Zehnder ComfoFix link for ComfoTube ø 75mm. The
mounting bracket can be prefixed on the floor/wall/
ceiling and allows the Zehnder ComfoTube ø 75mm to Side view
be clicked in place.
Several brackets can also be linked on the horizontal

or vertical level to fix Zehnder ComfoTube ø 75mm in
place. Over 50% of time can be saved on installation
using ComfoFix when compared to installation using
perforated metal banding without the risk of damage to
the ductwork. Front view
Height 90mm
Width 104.5mm
Depth 75mm
Weight 0.07 kg (each)
Top View
Material Glass fiber reinforced polypropylene
Ancillaries - Zehnder ComfoTube ø 75mm, pipe connector

Pressure Curve
Description
Pipe connector:
Zehnder ComfoTube ø 75mm, pipe connector. The Dimensions
connector is used to join two lengths of Zehnder
ComfoTube ø 75mm together to create an airtight and
robust seal using O-rings.
Technical Specification Side view

Height 164mm
Width 75.4mm
Depth 83.5mm
Weight 0.1kg
Material Medium-density polyethylene
Front view
Top View
Ancillaries - Zehnder ComfoTube end caps, 10
pieces 75mm
Pressure Curve
Description
End caps:
Zehnder ComfoTube end caps. The 75mm end caps can
be placed within their corresponding Zehnder ComfoTube
ø 75mm, during the construction phase to prevent dust
ingress.
Length 40.3mm
Diameter 67mm
Weight 0.016 kg
Ancillaries - Zehnder ComfoTube end caps, 10

pieces 90mm
Pressure
Article number: Curve
990 328 263
Description
End caps:
Zehnder ComfoTube end caps. The 90mm end caps can
be placed within their corresponding Zehnder ComfoTube
ø 90mm during the construction phase to prevent dust
ingress. The 90mm end caps can also be placed directly
into the 75mm manifold or mounting plate to seal off any
unwanted ports.
Length 53.3mm
Diameter 82mm
Weight 0.031 (each)
Ancillaries - Zehnder ComfoTube ø 75mm, O-ring
seal, 10 pieces
Pressure
Article number: Curve
990 328 362
Description
O-ring:
Zehnder ComfoTube O-ring seal. The O-ring is used to
ensure an airtight connection is made with pipe
connectors, grille housings, manifold/mounting plates and
connecting elements.
Outside diameter 81mm
Inside diameter 61mm
Weight 0.006kg (each)
Material EPDM (Ethylene Propylene Diene
Monomer)
BIM/CAD Components
If you would like to download the BIM / CAD files for this or any other of our products then please visit our BIM
library.
TO VISIT OUR BIM/CAD LIBRARY

CLICK HERE
Installation Instructions
If you would like to download the installation files for this or any other of our products then please visit our download
page by clicking the link below.
TO VISIT OUR DOWNLOAD PAGE
ComfoTube75mm_Technical_Specification_2018_
CLICK HERE
Consultant specification
Specification
The semi-rigid ductwork shall be duel wall constructed of high-quality food-grade plastic HDPE/LDPE with a crush
resistant ring stiffness of ~12.0 kN/m2. It shall be suitable for installation into concrete with a fire rating in accordance
with EN 13501 of E. It shall have an operating temperature range of -25 to +60 oC and not be designed to exceed
flowrates of 8.3l/s.
The ductwork shall have SKZ certification along with a hygiene certificate and be accredited for use in SAP
Appendix Q.
The ductwork shall be manufactured by Zehnder.
Zehnder Group UK Limited · Concept House, Watchmoor Point · Camberley · Surrey · GU15 3AD
T +44 1276 408404 · info@zehnder.co.uk · www.zehnder.co.uk

Zehnder Comfotube 75Mm

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Zehnder Comfotube 75Mm

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Available Formats

Zehnder ComfoTube

Manifold - See ComfoWell datasheet for all modular manifold options

CLD Grille housing

TVA Grille housing

Lamina / Bilamina Grille housing

Article number: 990 328 001 / 990 328 007

Weight per m 0.31 kg/m

Octave Band (Hz) Insertion Loss, dB

63 125 250 500 1000 2000 4000 8000

Acoustic performance measured according to EN ISO 7235 (pink noise)

For use with Zehnder ComfoWell, Manifolds and Grille housings.

Article number: TPDB1255

The mounting plate can be mounted on the top or front

For use with Zehnder ComfoTube ø 75mm semi-rigid ductwork.

Article number: TPDB16010

For use with Zehnder ComfoTube ø 75mm semi-rigid ductwork.

Article number: TPDB18015 Dimensions

The mounting plate can be mounted on the top or front

For use with Zehnder ComfoTube ø 75mm semi-rigid ductwork.

Article number: 990 320 810

The rectangular designer grilles (300 x 200mm and

For use with Zehnder CLD Designer grilles.

CLD Designer Grilles - Lateral Sleeve 85mm

Article number: 990 320 811

The rectangular designer grilles (300 x 200mm and

For use with Zehnder CLD Designer grilles.

Article number: 990 320 812

For use with Zehnder CLD Designer grilles. Top View

CLD Designer Grilles - Lateral Sleeve 115mm

Article number: 990 320 813

The rectangular designer grilles (300 x 200mm and

For use with Zehnder CLD Designer grilles.

Article number: 990 320 849

The rectangular designer grilles (300 x 200mm and

For use with Zehnder CLD Designer grilles.

CLD Designer Grilles - Lateral Sleeve 140mm

Article number: 990 320 850

The rectangular designer grilles (300 x 200mm and

Technical Specification Front view

The square (160 x 160mm) and circular designer grilles

TVA Grille housing - Grille housing TVA-P 75 connects

Article number: 990 326 121

The square (160 x 160mm) and circular designer grilles

The square (160 x 160mm) and circular designer grilles

Technical Specification Front view

Lamina / Bilamina Grille housing - Rectangular grille

The rectangular lamina / bilamina grilles can be used

Technical Specification Front view

The rectangular lamina / bilamina grilles can be used

For use with Lamina / Bilamina 400 rectangular grilles

Lamina / Bilamina Grille housing - Rectangular grille

Technical Specification Front view

For use with Lamina / Bilamina 600 rectangular grilles

The rectangular lamina / bilamina grilles can be used

Technical Specification Front view

For use with Lamina / Bilamina 600 rectangular grilles

Lamina / Bilamina Grille housing - Rectangular grille

The rectangular lamina / bilamina grilles can be used