AMS CR2 User manual

Unit 23, Second Avenue, Cookstown
Ind. Est., Tallaght, Dublin 24, D24 FP95.
Ph: [phone]
www.airmovementsupplies.ie
FIRE DAMPERS
CR2
Up to 120 minutes.
Suitable for installation in solid
floors/walls and flexible walls.
Manual handle or motorized.
From 200 Ø – 630 Ø.
Access port pre-fitted.
www.rft.be
en
Rf-Technologies nv Lange Ambachtstraat 40 9860 Oosterzele Belgium Tel [phone] Fax [phone] [e-mail]
0749
C1-EN-M 06/2021
CR2
Circular re damper for large diameters
" Imagination is everything.
It is a preview of life’s
coming attractions.
"
— Albert Einstein
TRUSTED PARTNER OF
Standard EN 15650
Conforms with:
Tested to EN 1366-2 (500Pa)
Classified under EN 13501-3
Leakage to EN 1571 (Class C)
AMF-69 Rev.0

2
3
Explanation of the abbreviations and pictograms
Explanation of the abbreviations and pictograms
Wn = nominal width
Hn = nominal height
Dn = nominal diameter
E = integrity
I = thermal insulation
S = smoke leakage
Pa = pascal
ve = vertical wall penetration
ho = horizontal floor penetration
o -> i = meets the criteria from the outside
(o) to the inside (i)
i <-> o = fire side not important
V AC = Volt alternating current
V DC = Volt direct current
E.TELE = power supply magnet
E.ALIM = power supply motor
V = volt
W = watt
Auto = automatic
Tele = remote controlled
Pnom = nominal capacity
Pmax = maximum capacity
GKB (type A) / GKF (type F): “GKB”
stands for standard plasterboards (type
A according to EN 520) while “GKF”
plasterboards offer a higher fire resistance
for a similar plate thickness (type F
according to EN 520)
Cal-Sil = calcium silicate
OP = option (delivered with the product)
KIT = kit (delivered separately for repair or
upgrade)
PG = connection flange to the duct
Sn = free air passage
ζ [-] = pressure loss coefficient
Q = airflow
∆P = static pressure drop
v = air speed in the duct
Lwa = A-weighted sound power level
Lw oct = sound power level per octave
midband
dB(A) = A-weighted decibel value
∆L = correction factor
large dimensions
EN 1751
B/C
air tightness in accordance with EN 1751: class B (class C
in option )
suitable for built-in installation minimal distance allowed
BASTA OK
sealing with fire resistant stone wool boards allowed,
also for asymmetric opening
Explanation of the abbreviations and pictograms

AMSRFT PARTNERSHIP RANGE 3
" The first one gets the oyster,
the second gets the shell.
"
— Andrew Carnegie
FIRE DAMPERS
CR2
Optimised circular fire damper for up to 120 minutes.
TRUSTED PARTNER OF
CONTENTS
Declaration of performance ...................................................... 4
Product presentation CR2 ....................................................... 5
Variant CR2-L500 .............................................................. 6
Evolution - Kits ................................................................. 7
Options - at the time of order ................................................... 10
Storage and handling ........................................................... 11
Installation .....................................................................12
Operation and mechanisms ......................................................31
Electrical connection ........................................................... 36
Weights ...................................................................... 38
Selection graphs ............................................................... 39
Sample order .................................................................. 40

AMSRFT PARTNERSHIP RANGE
4
4Declaration of performance
I-06/2021CE_DoP_Rf-t_C1_EN
DECLARATION OF PERFORMANCE Declarationofperformance CE_DoP_Rf-t_C1_EN I-06/2021
1. Unique identication code of the product-type: CR2 2. Intended use/es: Circular re damper to be used in conjunction with partitions to maintain re compartments in heating, ventilating and air conditioning
installations.
3. Manufacturer: Rf-Technologies NV, Lange Ambachtstraat 40, B-9860 Oosterzele 4. System/s of AVCP: System 1 5. Harmonised standard / European Assessment Document; notied body / European Technical Assessment, Technical Assessment Body,
notied body; certicate of constancy of performance:
EN 15650:2010, BCCA with identication number 0749; BCCA-0749-CPR-BC1-606-0464-15650.01-2517
6. Declared performance according to EN 15650:2010 (Fire resistance according to EN 1366-2 and classications according to EN 13501-3)
Essential characteristics Performance Range Wall type Wall Sealing Installation Classication
Ø 200-630 mm Rigid wall Aerated concrete ≥ 100 mm Mortar / Gypsum 1 EI 120 (vei no) S - (500 Pa)
Stone wool + coating ≥ 140 kg/m³ 1 EI 90 (vei no) S - (300 Pa) Stone wool Mulcol Multimastic SP + coating 1 EI 60 (vei no) S - (300 Pa)
Rigid oor Aerated concrete ≥ 150 mm Mortar 2 EI 120 (hoi no) S - (500 Pa)
Stone wool + coating ≥ 140 kg/m³ 2 EI 120 (hoi no) S - (300 Pa)
Flexible wall Metal studs gypsum plasterboard Type A (EN 520) ≥ 100 mm Stone wool ≥ 40 kg/m³ + cover plates 1 EI 60 (vei no) S - (500 Pa)
Gypsum 1 EI 60 (vei no) S - (500 Pa) Stone wool + coating ≥ 140 kg/m³ 1 EI 60 (vei no) S - (300 Pa)
Metal studs gypsum plasterboard Type F (EN 520) ≥ 100 mm Stone wool ≥ 40 kg/m³ + cover plates 1 EI 90 (vei no) S - (300 Pa)
Gypsum 1 EI 120 (vei no) S - (500 Pa) Mortar 1 EI 90 (vei no) S - (300 Pa) Stone wool Mulcol Multimastic SP + coating 1 EI 60 (vei no) S - (300 Pa) Stone wool + coating ≥ 140 kg/m³ 1 EI 90 (vei no) S - (300 Pa)
Paroc System Panel Sandwich panel type Paroc AST S ≥ 100 mm Hilti CFS-CT B 1S 3 EI 120 (vei no) S - (300 Pa) Gypsum blocks ≥ 70 mm Block glue 1 EI 120 (vei no) S - (500 Pa)
1 Type of installation: built-in,
0-360°. Minimal distances autho- rised with axis till 45°.
≥ 30 mm
≤ 45°360° ≥ 30 mm 2 Type of installation: built-in,
0-360°. Minimal distances authorised.
360° ≥ 30 mm ≥ 30 mm 3 Type of installation: built-in,
0/180° (CR)
≥ 30 mm ≥ 30 mm
Nominal activation conditions/sensitivity: Pass Response delay (response time): closure time Pass Operational reliability: cycling CFTH - 50 cycles; MANO - 300 cycles; B(L)F(T) - 10000 cycles; BFL(T) - 10000 cycles; BFN(T) - 10000 cycles; ONE - 10000 cycles; ONE-X - 10000 cycles; UNIQ - 10000 cycles Durability of response delay: Pass Durability of operational reliability: Pass Protection against corrosion according to EN 60068-2-52: Pass Damper casing leakage according to EN 1751: ≥ class B
Harmonised standard
EN 15650:2010
The performance of the product identied above is in conformity with the set of declared performance/s.This declaration of performance is issued, in accordance with Regulation (EU) No 305/2011, under the sole responsibility of the manufacturer identi- ed above.
Signed for and on behalf of the manufacturer by:
Mathieu Steenland, Technical Manager
Oosterzele, 06/2021
Declaration of performance

AMSRFT PARTNERSHIP RANGE 5
5
Product presentation CR2
Product presentation CR2
Circular fire damper available in the largest dimensions (up to a diameter of 630 mm) with a fire resistance up to 120 minutes. Its
refractory tunnel is made of galvanised steel and its blade consists of asbestos-free panels, which are resistant to humidity.
Fire dampers are installed where air ducts penetrate fire-resistant compartment walls. Their role is to restore the fire resistance grade
of the penetrated wall and to prevent smoke propagation. Fire dampers are distinguished by their degree of fire resistance, by their
aeraulic properties as well as by their installation ease. Rf-Technologies’ fire dampers are all CE marked. They can be equipped with
various types of mechanisms depending on the specific needs linked to the project or to the local regulations.
5large dimensions
∎suitable for built-in installation
∎minimal distance allowed
∎suitable for rigid wall, rigid floor and light wall (metal stud
gypsum plasterboard wall, gypsum blocks)
∎sealing with fire resistant stone wool boards allowed, also for
asymmetric opening
∎air tightness in accordance with EN 1751: class B (class C in
option )
∎tested according to EN 1366-2 up to 500 Pa
∎operating mechanism outside the wall
∎maintenance-free
∎for indoor use
∎operating temperature: max. 50°C
EN 1751
B/C BASTA OK
1. casing in galvanised steel
2. damper blade
3. operating mechanism
4. sealing cold smoke
5. blade bumper
6. intumescent strip
7. fusible link
8. rubber sealing ring
9. product identification
1
2
4
5
6
7
8
3
9
Range and dimensions CR2
ØDn [mm] 200 250 315 355 400 450 500 560 630
Exceeding blade: X = on the mechanism side, Y = on the wall side
X375 Y
230
50
ØDn-2
145
ØDn [mm] 315 355 400 450 500 560 630
x - - - - - 15 50
y 24 44 66 91 116 146 181
Product presentation CR2

AMSRFT PARTNERSHIP RANGE
6
6Range and dimensions CR2-L500
Variant CR2-L500
CR2 damper with a tunnel casing extension at the wall side to facilitate the connection to the duct when the supporting construction
is thicker than 100 mm.
1. casing in galvanised steel
2. damper blade
3. operating mechanism
4. sealing cold smoke
5. blade bumper
6. intumescent strip
7. fusible link
8. rubber sealing ring
9. product identification
1
2
4
5
6
8
3
9
7
Range and dimensions CR2-L500
ØDn [mm] 200 250 315 355 400 450 500 560 630
Exceeding blade: X = on the mechanism side, Y = on the wall side
230
500
ØDn-1
50
ØDn [mm] 560 630
x 15 50
y 21 56
ØDn < 315 mm ØDn ≥ 315 mm
ØDn P
Z
Q
ØDn P
Z
Q
CFTH ONE (X) BFL(T)
P81 105 101
Q182 199 110
Z58 60 80
CFTH ONE (X) BFL(T) BFN(T)
P85 105 104 104
Q182 199 110 110
Z156 157 179 179
Variant CR2-L500

AMSRFT PARTNERSHIP RANGE 7
7
Evolution - kits
Evolution - kits
KITS ONE T 24 FDCB Spring return actuator ONE 24V (with fusible link T) + bipolar beginning- and end-of-
range switch
KITS ONE T 24 FDCU Spring return actuator ONE 24V (with fusible link T) + unipolar beginning- and end-of-
range switch
KITS ONE T 230 FDCU Spring return actuator ONE 230V (with fusible link T) + unipolar beginning- and end-of-
range switch
KITS ONE T 230 FDCB Spring return actuator ONE 230V (with fusible link T) + bipolar beginning- and end-of-
range switch
KIT ONE-X 24 Spring return actuator ONE-X 24V (with fusible link T)
KIT ONE-X 230 Spring return actuator ONE-X 230V (with fusible link T)
KITS CFTH Automatic unlocking mechanism CFTH with FCU and without FTH 72
KITS BFL24 Spring return actuator BFL 24V
KITS BFL230 Spring return actuator BFL 230V
Evolution - Kits

AMSRFT PARTNERSHIP RANGE
8
8Evolution - kits
KITS BFL24-ST Spring return actuator BFL 24V with plug (ST)
KITS BFLT24 Spring return actuator BFL 24V with thermo-electric fuse (T)
KITS BFLT230 Spring return actuator BFL 230V with thermo-electric fuse (T)
KITS BFLT24-ST Spring return actuator BFL 24V with thermo-electric fuse (T) and plug (ST)
KITS BFN24 Spring return actuator BFN 24V
KITS BFN24 Spring return actuator BFN 24V (BFN kits must be used instead of BFL kits for fire dampers
produced before 1/7/2015)
KITS BFN230 Spring return actuator BFN 230V
KITS BFN24-ST Spring return actuator BFN 24V with plug (ST)
KITS BFNT24 Spring return actuator BFN 24V with thermo-electric fuse (T)

AMSRFT PARTNERSHIP RANGE 9
9
Evolution - kits
KITS BFNT230 Spring return actuator BFN 230V with thermo-electric fuse (T)
KITS BFNT24-ST Spring return actuator BFN 24V with thermo-electric fuse (T) and plug (ST)
KITS BF24 Spring return actuator BF 24V (BF kits must be used instead of BFN kits for fire dampers
produced before 1/7/2015)
KITS FDC CFTH 1 limit switch (FCU/DCU/FCB/DCB)
KITS SN2 BFL/BFN Auxiliary limit switch ‘open/closed’
KITS FTH72 Fusible link FTH 72°C (for CFTH)
KITS ZBAT 72 Black spare part for thermo-electric fuse for BFLT/BFNT
FUS72 ONE Fusible link 72°C
MECT Testbox for mechanisms 24/48 V (magnet, motor, beginning and end of range switches)

AMSRFT PARTNERSHIP RANGE
10
10 Options - at the time of order
EPP CR2 Kit with 4 cover plates (gypsum plasterboard 12.5 mm) for CR2 in light wall.
INSPECAM
Sturdy digital endoscope for the internal inspection of fire dampers through an optional
inspection opening. The endoscope features a 1 meter long probe with a diameter of 8,2
mm equipped with a dimmable LED, a removable 4x zoom, a colour LCD monitor 3.5”.
Photographic capture 3MP and video capture 720P.
Options - at the time of order
UL Inspection opening to visually determine the state and the position of the damper, by
using an endoscope.
EN 1751
C
EN1751_C Air-tightness class C (note: for CU2 H > 600 or W > 800 / for CR2 Ø > 315).
ONE-X CN Connectors for the bus cables and the power cable.
Options - at the time of order

AMSRFT PARTNERSHIP RANGE 11
11
Storage and handling
Storage and handling
As this product is a safety element, it should be stored and handled with care.
Avoid:
• any kind of impact or damage
• contact with water
• deformation of the casing
It is recommended:
• to unload in a dry area
• not to flip or roll the product to move it
• not to use the damper as a scaffold, working table, etc.
• not to store smaller dampers inside larger ones
Installation
General points
∎The installation must comply with the installation manual and the classification report.
∎Axis orientation: see the declaration of performance.
∎Avoid obstruction of adjoining ducts.
∎Product installation: always with closed damper blade.
∎Verify if the blade can move freely.
∎Please observe safety distances with respect to other construction elements. The operating mechanism must also remain
accessible: allow for a clearance of 200 mm around the housing.
∎The air tightness class will be maintained if the damper is installed according to the installation manual.
∎Rf-t fire dampers are always tested in standardised constructions according to EN 1366-2. The achieved results are valid for similar
supporting constructions with a fire resistance, thickness and density equal or superior to the supporting construction used
during the test.
∎The damper must remain accessible for inspection and maintenance.
∎Schedule at least 2 visual checks each year.
2020
2021
2022
2023
2024
TEST
 | 
 | 
 | 
 | 
 | 
Storage and handling

AMSRFT PARTNERSHIP RANGE
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12 Installation
Installation at a minimal distance from another damper or from an adjacent supporting construction
≥ 75 mm
≥ 75 mm ≥ 200 mm ≥ 200 mm
≥ 30 mm ≥ 30 mm ≥ 200 mm
≥ 30 mm
1. Principle
According to the European test standard, a fire damper must
be installed at a minimum distance of 75 mm from an adjacent
wall and 200 mm from another damper, unless the solution was
tested at a shorter distance.
This range of Rf-t fire dampers has been successfully tested
and can be installed in a vertical or horizontal supporting
construction, at a distance below the minimum set by the
standard.
For circular dampers, the minimal distance is set to 30 mm.
A
B
2. Certified solution
For the Rf-t fire dampers, the solution consists of the following
elements: A: Universal sealing for minimal distance; B:
Sealing compliant with existing classifications (Declaration of
Performance).
A. Sealing of the opening at the side with minimal distances
between damper and wall/ceiling or another fire damper: rigid
stone wool panels (150 kg/m³) are applied to a depth of min.
400 mm, of which 150 mm on the mechanism side of the wall.
On the non-mechanism side of the wall, the stone wool panels
must be at least flush with the wall.
The surface of this sealing is set between the axes (centres) of
the dampers.
B. Sealing of the rest of the opening according to the existing
classifications for the fire damper (Declaration of Performance).
This also applies to circular dampers that are mounted at a
minimum distance from one another (30 to 200 mm) but at a
distance greater than 75 mm from a wall/ceiling.
Detailed information for each wall/sealing combination can be
found in the respective installation methods.
30 mm
30 mm
30 mm
200
mm
max 45°
max 45°
3. Restrictions
The orientation of the blade axis should be horizontal or
oriented at a maximum of 45°.
A maximum of 3 circular dampers can be installed at a
minimum distance from one another, both vertically and
horizontally (with a maximum cluster of 4 dampers).
Note: when sealing the opening with panels of fire resistant
stone wool, the maximum number of dampers also depends
on the maximum “blank seal” allowed for the selected sealing
material. Please refer to the manufacturer’s instructions for this
information.
1 2
3
Installation

AMSRFT PARTNERSHIP RANGE 13
13
Installation
Installation in a rigid wall
The product was tested and approved in:
Range Wall type Sealing Classication
Ø 200-630 mm Rigid wall Aerated concrete ≥ 100 mm Mortar / Gypsum EI 120 (vei no) S - (500 Pa)
Ø 200-630 mm Rigid wall Aerated concrete ≥ 100 mm Mortar / Gypsum EI 90 (vei no) S - (300 Pa)
230
375
≥100
≤ Dn+100 mm (300 Pa)
≤ Dn+80 mm (500 Pa)
≤ Dn+100 mm (300 Pa)
≤ Dn+80 mm (500 Pa)
Plaster /
Mortar
230
375
≥100
≤ Dn+100 mm (300 Pa)
≤ Dn+80 mm (500 Pa)
Plaster /
Mortar
TEST!
B < 200mm
≥ 30
50
50
≥ 30
50
50
B
≥ 30
4. The dampers can be installed at a minimum distance
(≥ 30 mm) from an adjacent wall or from another damper.
1 2
3 4

AMSRFT PARTNERSHIP RANGE
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14 Installation
35%
≥100
5. Make the necessary openings (≤ Dn + 100 mm) /
(≤ Dn + 80 mm) in the wall.
400 mm
≥150 kg/m³
6. Mount the dampers in the opening.
Apply rigid stone wool panels (≥ 150 kg/m³) to a depth of
400 mm (150 mm on the mechanism side of the wall) to seal
the opening at the side with minimal distances.
The surface of this sealing is set between the axes (centres) of
the dampers.
Caution: the opening is sealed according to the existing
classification (see next point) when:
- 2 fire dampers are installed at a minimum distance from
one another but at a normal distance (≥ 75 mm) from the
wall or floor/ceiling.
- One single (no cluster) fire damper is located at a minimum
distance (≤ 75 mm) from a wall or floor/ceiling.
Plaster /
Mortar
7. Seal the rest of the opening with standard mortar or gypsum.
5 6
7

AMSRFT PARTNERSHIP RANGE 15
15
Installation
Installation in rigid floor
The product was tested and approved in:
Range Wall type Sealing Classication
Ø 200-630 mm Rigid oor Aerated concrete ≥ 150 mm Mortar EI 120 (hoi no) S - (500 Pa)
60%
≤ Dn+80 mm
≤ Dn+80 mm
≥ 150 mm
100 mm
230
375
Mortar
TEST!
B < 200mm
40
≥ 30
≥ 30
B
≥ 30
40
3. The dampers can be installed at a minimum distance
(≥ 30 mm) from an adjacent wall or from another damper.
≥ 150 mm
4. Make the necessary openings (≤ Dn + 80 mm) in the floor.
1 2
3 4

AMSRFT PARTNERSHIP RANGE
16
16 Installation
400 mm
≥150 kg/m³
5. Mount the dampers in the opening.
Apply rigid stone wool panels (≥ 150 kg/m³) to a depth of
400 mm (150 mm on the mechanism side of the wall) to seal
the opening at the side with minimal distances.
The surface of this sealing is set between the axes (centres) of
the dampers.
Caution: the opening is sealed according to the existing
classification (see next point) when:
- 2 fire dampers are installed at a minimum distance from
one another but at a normal distance (≥ 75 mm) from the
wall or floor/ceiling.
- One single (no cluster) fire damper is located at a minimum
distance (≤ 75 mm) from a wall or floor/ceiling.
Mortar
6. Seal the rest of the opening with standard mortar.
5 6

AMSRFT PARTNERSHIP RANGE 17
17
Installation
Installation in flexible wall (metal stud gypsum plasterboard wall)
The product was tested and approved in:
Range Wall type Sealing Classication
Ø 200-630 mm Flexible wall Metal studs gypsum plasterboard Type F (EN 520) ≥ 100 mm Stone wool ≥ 40 kg/m³ + cover plates EI 90 (vei no) S - (300 Pa)
Ø 200-630 mm Flexible wall Metal studs gypsum plasterboard Type A (EN 520) ≥ 100 mm Stone wool ≥ 40 kg/m³ + cover plates EI 60 (vei no) S - (500 Pa)
50
2x12.5 /
1x25 mm
Dn+50 mm
60’
90’
F (EN520)/GKF
A (EN520)/GKB
Dn+50 mm
≥ 40 kg/m³
≤ 625 mm
Dn+200 mm
230 mm
Dn+200 mm
Dn+5 mm
≥ 40 kg/m³
1.
3.
2.
M6
Plaster JointFiller
TEST!
A
A
A
A
≥ 30
≥ 30
B
A
A
AA
≥ 30
A 25 mm
B < 200 mm
≥ 30
≤ 625 mm 40 mm
5. The dampers can be installed at a minimum distance
(≥ 30 mm) from an adjacent wall or from another damper.
50
50
2x12.5 / 1x25 mm
≥ 40 kg/m³
6. Build the drywall and foresee horizontal and vertical studs
around the opening.
In the opening around the dampers (Dn + 50 mm), the void
between the gypsum boards is filled with stone wool with a
minimum density of 40 kg/m³.
1 2
3 4
5 6

AMSRFT PARTNERSHIP RANGE
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18 Installation
400 mm
≥150 kg/m³
7. Mount the dampers in the opening.
Apply rigid stone wool panels (≥ 150 kg/m³) to a depth of
400 mm (150 mm on the mechanism side of the wall) to seal
the opening at the side with minimal distances.
Caution: the opening is sealed according to the existing
classification (see next point) when:
- 2 fire dampers are installed at a minimum distance from
one another but at a normal distance (≥ 75 mm) from the
wall or floor/ceiling.
- One single (no cluster) fire damper is located at a minimum
distance (≤ 75 mm) from a wall or floor/ceiling.
Dn+5 mm
Dn+200 mm
Plaster jointller
8. Apply cover plates (gypsum plasterboards) to finish the
surface at both sides.
Seal off the space between the plasterboards with jointfiller.
7 8

AMSRFT PARTNERSHIP RANGE 19
19
Installation
Installation in flexible wall (metal stud gypsum plasterboard wall), sealing with gypsum
The product was tested and approved in:
Range Wall type Sealing Classication
Ø 200-630 mm Flexible wall Metal studs gypsum plasterboard Type A (EN 520) ≥ 100 mm Gypsum EI 60 (vei no) S - (500 Pa)
Ø 200-630 mm Flexible wall Metal studs gypsum plasterboard Type F (EN 520) ≥ 100 mm Gypsum EI 120 (vei no) S - (500 Pa)
≤ Dn+80 mm
≤ 625 mm
50
2x12.5 /
1x25 mm
≥ 40 kg/m³
≤ Dn+
80 mm
≤ Dn+
80 mm
230 mm
Plaster
A
A
A
A
A
A
A
AA
A
≥ 30
≥ 30
≥ 30
A ≤ 40 mm
B < 200 mm
B
≥ 30
≤ 625 mm 40 mm
Plaster
3. The dampers can be installed at a minimum distance
(≥ 30 mm) from an adjacent wall or from another damper.
50
50
2x12.5 / 1x25 mm
≥ 40 kg/m³
4. Build the drywall and foresee horizontal and vertical studs
around the opening.
In the opening around the dampers, the void between the
gypsum boards is partially filled (up to Dn + 80 mm) with stone
wool with a minimum density of 40 kg/m³.
1 2
3 4

AMSRFT PARTNERSHIP RANGE
20
20 Installation
400 mm
≥150 kg/m³
5. Mount the dampers in the opening.
Apply rigid stone wool panels (≥ 150 kg/m³) to a depth of
400 mm (150 mm on the mechanism side of the wall) to seal
the opening at the side with minimal distances.
The surface of this sealing is set between the axes (centres) of
the dampers.
Caution: the opening is sealed according to the existing
classification (see next point) when:
- 2 fire dampers are installed at a minimum distance from
one another but at a normal distance (≥ 75 mm) from the
wall or floor/ceiling.
- One single (no cluster) fire damper is located at a minimum
distance (≤ 75 mm) from a wall or floor/ceiling.
Plaster
6. Seal the rest of the opening with standard gypsum across the
entire wall thickness.
5 6