Lindab RECTANGULAR Series Installation and operation manual

English
For further information please refer to the Technical Manual.
As the manufacturer is constantly improving its products, the aesthetic or dimensional features, the technical data, the equipment and acces-
sories indicated could be subject to variations.
Installation booklet
RECTANGULAR SERIES WKS25 - 500 Pa
Cert. N° 1812-CPR-1046 EN 15650
This is a 15 page installation booklet.
www.mp3-italia.it
*1MUBWKS25EN*
*1MUBWKS25EN* rev 19-05
www.lindab.com - Fire dampers are manufactured by MP3 Srl www.mp3-italia.it
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*1MUBWKS25EN-LIND* rev 19-05
WKS25

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OVERVIEW
Fire resistance classication according to EN 13501-3-2009
EI 120 S
(500 Pa)
EI 90 S
(500 Pa)
EI 60 S
(500 Pa)
EI 30 S
(500 Pa)
Rigid wall
EI 120 S Installation within vertical rigid wall
Wall minimum thickness 100 mm
Wall minimum density 550 kg/m³
Plasterboard and rock wool 100 kg/m³ sealing
ve (i↔o)
DB x H min 100 x 200
max 800 x 600
B x H
min 100 x 200
max 800 x 600
B x H
min 100 x 200
max 800 x 600
B x H
min 100 x 200
max 800 x 600
Flexible wall
EI 120 S Installation within vertical light wall (plasterboard)
Wall minimum thickness 100 mm
Wall rock wool density up to 100 kg/m³ (optional)
Plasterboard sealing
ve (i↔o)
DB x H min 100 x 200
max 800 x 600
B x H
min 100 x 200
max 800 x 600
B x H
min 100 x 200
max 800 x 600
B x H
min 100 x 200
max 800 x 600
EI 90 S Installation within vertical light wall (gypsum blocks wall)
Wall minimum thickness 70 mm
Wall minimum density 995 kg/m³
Plasterboard sealing
ve (i↔o)
D - B x H min 100 x 200
max 800 x 600
B x H
min 100 x 200
max 800 x 600
B x H
min 100 x 200
max 800 x 600
EI 120 S Installation within vertical light wall (gypsum blocks wall)
Wall minimum thickness 100 mm
Wall minimum density 995 kg/m³
Plasterboard sealing
ve (i↔o)
DB x H min 100 x 200
max 800 x 600
B x H
min 100 x 200
max 800 x 600
B x H
min 100 x 200
max 800 x 600
B x H
min 100 x 200
max 800 x 600
B X H are re damper minimum and maximum nominal dimensions (base x height) in mm
ve Vertical installation
ho Horizontal installation
(i↔o) Origin of re irrelevant
Pa Pascal of depression
E Integrity
I Thermal insulation
S Smoke seal
W Wet method sealing
D Dry method sealing
Cert. N° 1812-CPR-1046 EN 15650
Installations within vertical light wall (Shaft wall)
EI 90 S
(300 Pa)
EI 60 S
(300 Pa)
EI 30 S
(300 Pa)
Flexible wall
EI 90 S Installation within vertical light wall (Shaft wall)
Wall minimum thickness 90 mm
Plasterboard sealing
ve (i↔o) DB X H
min 100 X 200
max 800 X 600
B X H
min 100 X 200
max 800 X 600
B X H
min 100 X 200
max 800 X 600

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Fire dampers pairing for big ducts dimensions
1. It is allowed to pair two re dampers. Maximum paired size: 1645x600, 1245x800, 800x1245.
2. It is forbidden to pair three or more re dampers.
3. It is forbidden to vertically pair two re dampers with vertical axis.
Fixing aps
1. Bend for walls 100 mm thick or higher
2. Bend for walls 70 mm thick or higher
Fire dampers pairing
The patented WKS25 rectangular re dampers can be paired side-by-
side or vertically (not more than two) using the custom connection
kit (see section Accessories and spare parts) which includes an intu-
mescent gasket to be placed between the two dampers.
The pair of dampers, may be installed in vertical wall in the same way
as a single damper.

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1. WKS25 Fire damper
2. Steel prole designed as a function of the pairing lenght
3. Steel plate
4. Fixing screws
5. Intumescent gasket long as a function of the pairing lenght
• It is forbidden to pair three or more re dampers.
1. WKS25 Fire damper
2. Steel prole designed as a function of the pairing lenght
3. Steel plate
4. Fixing screws
5. Intumescent gasket long as a function of the pairing lenght
• It is forbidden to pair three or more re dampers.
• It is forbidden to vertically pair two re dampers with vertical axis.
Mechanism type
Manual and compact manual
Manual
Compact manual
1. Manual opening lever
2. Manual closing button
3. Lever position when the blade is open
4. Lever position when the blade is closed
Blade closing mode
Automatic closing with thermal fuse.
The control mechanism has a thermosensitive element that auto-
matically closes the blade when the temperature in the duct exceeds
70°C (or 95°C for the re damper with 95°C thermal fuse).
It is possible to close the damper by pressing the indicated button.
Blade opening mode
The damper must be opened when the ventilation system if
switched o.
It is possible to open the damper blade by rotating the lever anti-
clockwise.
In case of closed damper as a result of the action of the thermosen-
sitive element, it is possible to manually reopen the damper by rotat-
ing the lever counterclockwise once the element has been replaced.
Position indication microswitches
On request, the re damper can be supplied with position mi-
croswitches (S2 optional) that signal the blade position (open or
closed). Refer to the section Electrical connections for more details.
Closing by remote control
Not available
Temperature calibration of thermosensitive element for auto-
matic damper closing
70 °C±7 °C (Standard)
95 °C±9 °C (On request).
CAUTION: The compact mechanism is not interchangeable
with other types of manual mechanism.

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Manual with magnet
1. Manual opening lever
2. Manual closing button
3. Lever position when the blade is open
4. Lever position when the blade is closed
Blade closing mode
Automatic closing with thermal fuse.
The control mechanism has a thermosensitive element that auto-
matically closes the blade when the temperature in the duct exceeds
70°C (or 95°C for the re damper with 95°C thermal fuse).
It is possible to close the damper by pressing the indicated button.
It is possible to remotely close the re damper.
The manual command mechanism with magnet is equipped with
an electromagnet which, in case power is interrupted (interuption
magnet version) or when power is supplied (input magnet version),
comands the closing of the damper.
Blade opening mode
The damper must be opened when the ventilation system if
switched o.
In case of closed damper by pressing the closing button or remotely
by electromagnet, it is possible to manually open the re damper
blade by rotating the lever antyclockwise.
In case of closed damper as a result of the action of the thermosen-
sitive element, it is possible to manually reopen the damper by rotat-
ing the lever counterclockwise once the element has been replaced.
Position indication microswitches
It is advisable to install the re damper with position microswitches
(S2 optional) which signal the position of the blade (open or closed).
Refer to the section Electrical connections for more details.
Closing by remote control
With power supply input or interruption magnet.
Temperature calibration of thermosensitive element for auto-
matic damper closing
70 °C±7 °C (Standard)
95 °C±9 °C (On request).
Belimo motorized version
1. Manual closing switch
2. Manual opening lever
3. Position indicator
4. Blade locking lever
Blade closing mode
Automatic closing with thermal fuse.
The control mechanism has a thermosensitive element that auto-
matically closes the blade when the temperature in the duct or in
the room exceeds 72°C (or 95°C for the 95°C version).
To close the damper when the motor is connected, press the switch
on the temperature sensor or cut o the power supply.
Blade opening mode
The damper must be opened when the ventilation system if
switched o.
To open the damper with the electric motor driven actuator, provide
power supply to the motor. Refer to the section Electrical connec-
tions for further information.
To manually open the damper, use the handle supplied and carefully
rotate clockwise to the 90° indicator. To hold the damper in open
position operate on the lever indicated in gure.
During the manual opening of the damper, power must not be sup-
plied to the motor.
Position indication microswitches
The motorized versions are supplied with two microswitches to
show the blade's position (open or closed). Refer to the section Elec-
trical connections for further information.
Closing by remote control
If power to the motor is cut o, the blade will close.
Temperature calibration of thermosensitive element for auto-
matic damper closing
72 °C±7 °C (Standard)
95 °C±9 °C (On request).
Siemens motorized version
1. Manual closing switch
2. Manual opening lever
3. Screwdriver
4. Position indicator
Blade closing mode
Automatic closing with thermal fuse.
The control mechanism has a thermosensitive element that auto-
matically closes the blade when the temperature in the duct or in
the room exceeds 72°C (or 95°C for the 95°C version).
To close the damper when the motor is connected, press the switch
on the temperature sensor or cut o the power supply.
Blade opening mode
The damper must be opened when the ventilation system if
switched o.
To open the damper with the electric motor driven actuator, provide
power supply to the motor. Refer to the section Electrical connec-
tions for further information.
To manually open the damper, use the handle supplied and carefully
rotate counterclockwise to the 90 °C indicator. To hold the damp-
er in open position, rotate the screw anticlockwise as shown in the
picture.
During the manual opening of the damper, power must not be sup-
plied to the motor.
Position indication microswitches
The motorized versions are supplied with two microswitches to
show the blade's position (open or closed). Refer to the section Elec-
trical connections for further information.
Closing by remote control
If power to the motor is cut o, the blade will close.

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Temperature calibration of thermosensitive element for auto-
matic damper closing
72 °C±7 °C (Standard)
95 °C±9 °C (On request).
ELECTRICAL CONNECTIONS
Electrical wiring
Electrical connections must be done by qualied and trained people.
Switch o the power supply before starting any work on the electric
elements. Never switch on the power supply during electrical con-
nections.
Manual and compact manual
S1-25 electric board (S2 optional) for blade position microswitches (manual)
S1-25-B electric board (S2 optional) for blade position microswitches (compact
manual)
1 Microswitch contacts for blade position
FCU Closed blade contact
DCUOpen blade contact
NO Normally open
C Common
NF Normally closed
Manual with magnet - MR/MI version (the magnet is powered
using 24 V DC/48 V DC through S0-25 electric board)
S0-25 electronic board (S2 optional) for 24V DC / 48V DC power supply. Blade
position microswitches included
1 Microswitch contacts for blade position
2 Magnet power supply contacts. 24V DC or 48V DC. Keep to the polarity for
input magnet
MAG Magnet power supply
FCU Closed blade contact
DCUOpen blade contact
NO Normally open
C Common
NF Normally closed
S2 microswitches position for manual control and magnetic
control
1. The re damper's blade is open (the air ow is allowed)
2. The re damper's blade is closed (the air ow is not allowed)
FCU Closed blade contact
DCUOpen blade contact
Motorized version
Belimo servomotor:
BFL24T, BFN24T, BF24T, BFL230T, BFN230T, BF230T.
Siemens servomotor:
GRA126, GNA126, GGA126.

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Siemens servomotor:
GRA326, GNA326, GGA326.
Motorized re dampers electical wiring
To connect the dampers to the power supply, proceed as follows:
• Check that the voltage and electrical frequency are equivalent to
those of the motor of the servomotor (check the motor's informa-
tion label);
• Make the connections as shown in the below diagram.
Microswitches position for motorized version
1 Negative (DC) or neutral (AC)
2 Positive (DC) or phase (AC)
3 Phase
4 Neutral
S1 Common closed damper microswitch
S2 Normally closed, closed damper microswitch
S3 Normally opened, closed damper microswitch
S4 Common open damper microswitch
S5 Normally closed, open damper microswitch
S6 Normally opened, open damper microswitch
Electrical specications
Manual and compact manual
Manual with magnet
Belimo motorized version
Siemens motorized version
Voltage and power consumption -
Magnet (WKS25MR/MI):
24/48 V DC (automatic voltage switching
on S0-25 electric board for 24V magnet)
Power interrruption magnet (MR):
P = 1,6 W Power input magnet (MI): P = 3,4 W
Motor 24V AC/DC (WKS25VSB):
Belimo BFL24T
Opening: 2,5 W
In stand-by: 0,8 W
230V AC motor (WKS25DSB):
Belimo BFL230T:
Opening: 3,5 W
In stand-by: 1,1 W
Motor 24V AC/DC (WKS25VSS):
Siemens GRA126
Opening: 3,5 W
In stand-by: 2 W
Motor 230V AC (WKS25VSS)
Siemens GRA326
Opening: 4,5 W
In stand-by: 3,5 W
Microswitches position contacts Manual control version: 12VDC / 2A
125VAC / 0,1A
Motorized version:
Siemens: AC 24V…230V / 6 (2)A
Belimo: DC 5V…AC 250V / 1mA…3A (0,5A)
Blade closing time Spring: 1 s motor: < 30 s
Protection degree IP42 IP42 MAGNETIC VERSION
IP54 MOTORIZED VERSION
MAINTENANCE AND INSPECTIONS
Fire dampers and control mechanisms do not require routine main-
tenance.
Extraordinary maintenance (repairs) and periodic inspection opera-
tions are the responsibility of the ventilation system operator.
The implementation of a periodic inspection plan allows to guaran-
tee the eciency and functionality of the re dampers for the re
safety of the building.
Periodic inspection and cleaning
Periodic inspection shall be performed in accordance with the re-
quirements of the law or by the building regulations or other local
regulations.
In the absence of specic regulations (or to their complement), in ac-
cordance with point 8.3 of the EN 1560 standard, it is recommended
to carry out the following control activities at intervals of no more
than 6 months:
• If the damper is connected to a remote control or command sys-
tem (eg BMS or alarm or re detection), that responds correctly to
commands by performing at least one opening and closing test

8/15
and verifying the correct movement of the blade and the correct
functioning of the microswitches (limit switches).
• If the damper is not connected to a remote control or command
system, manually execute an opening and closing test and check
the correct movement of the blade and the correct functioning of
the microswitches (limit switches) if present.
Together with the control activities, it is recommended to visually
verify the absence of corrosion, the integrity of the electrical wiring
and the sealing of the construction support.
Damper cleaning is included in the ordinary maintenance activities
of the ventilation ducts.
Fire dampers can be cleaned with a dry or wet cloth.
In the case of resistant dirt, it is possible to use normal household
detergents.
If prescribed for the type of building, it is possible to use disinfectant
detergents.
The use of detergents or mechanical abrasive cleaning systems is not
permitted.
These indications comply with the standards EN 15650 annex D and
EN 15423 annex C.
Repair
For safety reasons, repair activities involving re-ghting compo-
nents must be carried out only by qualied personnel.
Only original spare parts supplied by the re damper manufacturer
must be used.
A functional test must be performed after each repair.
.
At the end of the inspection, cleaning or repair operations, check that
the re damper is in the normal operating position.
Keep records of all inspections, repair activities, any problems en-
countered and their resolution.
This practice, even when not mandatory, is very useful in practice.
Disposal
Disposal in case of destruction must be carried out in accordance
with national legislation. For electrical and electronic parts also refer
to EU Directive 2011/65.
INSTALLATION
The sizes shown are in mm.
It is recommended to perform a functional test before Installation to
exclude possible damage during transport and another test immedi-
ately after installation to exclude accidental damage to the product
and interference with mounting components.
Blade rotation axis positioning
The re damper can be installed both with the blade axis positioned
vertically or horizontally.
Positioning brackets before xing
1. Positioning brackets
Installation of exible connectors in order to balance out the
ventilation ducts expansion
CAUTION: Refer anyway to law and national standardization.
Flexible connectors compensate any duct thermal expansion and
wall bending in case of re.
Flexible connectors are used to limit re damper stresses due to ex-
ternal forces in case of re and to preserve re resistance class.
In general it is always appropriate the use of exible connectors for
the followings installations:
– light walls;
– Plasterboard and rock wool or Fire Batt (Weichschott) sealing;
– Applique xing system.
Flexible connector must be normal ammability and in case of re
the grounding bonding should disconnet to guarantee the com-
plete separation between re damper and connected air duct.
When exible connectors made of conductive material (e.g. alumi-
num) are used, no additional grounding bonding is required.
Despite exible connector installation, the re damper must be in-
stalled in the construction support so that its weight does not aect
damper’s installation position both during normal operation and in
case of re.
It is recommended not to compress exible connectors in the in-
stallation phase.
Flexible connector must be at least 100mm long and in order that
possible duct thermal expansions are balanced.
Take care that the exible connector does not interfer with opening
/ closing movement of the blade.
Transfer Application (application not connected to air ducts on
one or both sides)
Following tests performed as per EN 1366-2, section 6.3.6 Standard,
it is possible to install the re damper free from air duct from one or
both sides.
• Attention: re resistance classication for transfer application is
conform to section Fire resistance classication according to EN
13501-3-2009 limited to EI 120S if the ducted classication is high-
er.
• End cap with mesh shall be mounted on the side not connected
to air duct.
• End cap with mesh is made from galvanized steel sheet and in-
cludes nuts and screws for xing on re damper.
• End cap with mesh is supplied loose from the re damper.

9/15
Components (Transfer Application)
1. Extension duct with net, 12 x 12 mm mesh opening
2. Fire damper
3. M8 nut
4. M8 screw
Technical data (Transfer Application)
1. Mechanism side
2. Mechanism opposite side
3. End cap with mesh
L1 End cap length mechanism side
L2 End cap length mechanism
opposite side
H Nominal height of re damper
Length of end cap with mesh depending on re damper
height H.
H L1 L2
200 50 50
250 50 100
300 50 100
350 50 150
400 50 150
450 50 200
500 50 200
550 50 250
600 100 250
H Nominal height of re damper
L1 End cap length mechanism side
L2 End cap length mechanism opposite side
Minimum distances
It is recommended to keep enough space for using the control
mechanism or for maintenance.
In accordance with Articles 7 and 13 of EN 1366-2 respect the mini-
mum distances indicated below.
Minimum distances
1. Side vertical wall
2. Floor
a. Distance between re dampers installed within vertical wall
b. Distance between re damper and vertical lateral wall / oor

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Fire dampers installed within vertical wall Fire dampers installed within oor
Installation a [mm] b [mm] c [mm] d [mm] Paired installation
Rigid
wall
EI 120 S Installation within vertical
rigid wall
Plasterboard sealing 44 22 - - Yes. One air duct
Flexible wall
EI 120 S Installation within vertical light
wall (plasterboard)
Plasterboard sealing 44 22 - - Yes. One air duct
EI 120 S Installation within vertical light
wall (gypsum blocks wall)
Plasterboard sealing 44 22 - - Yes. One air duct
EI 90 S Installation within vertical light
wall (gypsum blocks wall)
Plasterboard sealing 200 75 - - No
The minimum distance between two or more paired installations is
200 mm. It is forbidden to pair three or more re dampers.
1. One air duct
Installations within vertical light wall (Shaft wall)
Fire dampers installed within vertical wall Fire dampers installed within oor
Installation a [mm] b [mm] c [mm] d [mm]
Flexible wall
EI 60 S Installation within vertical light wall (Shaft wall)
Plasterboard and mortar or plaster putty sealing 200 75 - -
Construction supports characteristics
The European standard for re dampers foresees a precise correlation
between the wall/oor characteristics and the re resistance class
obtained, as well as the correlation between wall/oor used for the
test and wall/oor used for the actual installation.
The test results obtained on a type of wall/oor are valid also for
walls/oor of the same type but with greater thickness and/or densi-
ty than those used in the test.
For plasterboard walls, the test results are also valid for walls with a
greater number of plasterboard layers on each side.
As a result, the indicated thickness and density characteristics are to
be considered as minimum values.
The wall/oor in which the re dampers are installed must be re
class certied according to the standards foreseen for the structure.
Rigid walls
Can be made with aerated concrete blocks, poured concrete, con-
crete panels, perforated cell elements in concrete or brick in accord-
ance with the following characteristics:
• minimum thickness 100 mm;
• minimum density 550 kg/m³.
The use of a reinforcing beam above the opening is recommended
for walls made from concrete blocks, bricks or in concrete cell ele-
ments.
For walls built with perforated elements, it is also recommended that
the area of the opening be made from full elements (for example
aerated concrete blocks) to guarantee the correct adhesion of the
mortar.
1. Reinforcing beam
Light plasterboard vertical walls
During testing, light plasterboard walls have been used with the fol-
lowing characteristics:
• U-shaped horizontal metal frame (50 mm) and C-shaped vertical
frame (49 mm) made from 0,6 mm thick sheet metal;

11/15
• Vertical proles placed with a maximum spacing of 625 mm be-
tween each other;
• Filling made of rock wool with density up to 100 kg/m³ (optional);
• Each side is made from two plasterboard layers 12,5 mm thick, un-
alinged to avoid alignment between the joints of the layer above
and below.
The following indications are given for the installation walls:
• metal proles minimum width: 49 mm;
• metal proles minimum thickness: 0,6 mm;
• vertical proles placed with a maximum spacing of 625 mm be-
tween each other;
• vertical prole xing with selfthreading screws or by clinching to
the bottom horizontal prole and insertion in the top horizontal
prole;
• proles xed using self-threading screws or by clinching on every
intersection.
• installation of a frame around the damper with base and height
where shown in the installation instructions;
• Filling made of rock wool with density up to 100 kg/m³ (optional);
• each side is made from two plasterboard layers 12,5 mm minu-
mum thick, unalinged to avoid alignment between the joints of
the layer above and below.
• the front plasterboards layers are xed using long enough screws
to pass through the lower plasterboard and attach to the steel pro-
le underneath.
1. Plasterboard thickness 12,5 mm
2. Rock wool density up to 100 kg/m³ (optional)
3. Horizontal U-shaped prole
4. Vertical C-shaped prole
5. Self-drilling screw Ø 3,5 X 25 mm
6. Self-drilling screw Ø 3,5 X 35 mm
Light plasterboard vertical walls (Shaft wall)
The following indications are given for the installation walls:
• U-shaped horizontal metal frame (minimum width 50 mm) and
C-shaped vertical frame (minimum width 49 mm) made from
sheet metal (minimum thickness 0,6 mm);
• vertical proles placed with a maximum spacing of 1000 mm be-
tween each other;
• vertical prole xing with selfthreading screws or by clinching to
the bottom horizontal prole and insertion in the top horizontal
prole;
• proles xed using self-threading screws or by clinching on every
intersection.
• installation of a frame around the damper with base and height
where shown in the installation instructions;
• one side is made from two plasterboard layers 20 mm minumum
thick, unalinged to avoid alignment between the joints of the layer
above and below;
• the front plasterboards layers are xed using long enough screws
to pass through the lower plasterboard and attach to the steel pro-
le underneath.
1. Plasterboard thickness 20 mm
2. Horizontal U-shaped prole
3. Vertical C-shaped prole
4. Self-drilling screw Ø 3,5 X 35 mm
5. Self-drilling screw Ø 3,5 X 55 mm

12/15
Gypsum blocks light walls
Gypsum blocks wall can be built with special solid gypsum blocks
with interlocking shaped edges as indicated in the supplier's instruc-
tions and according to the following characteristics:
• minimum thickness 70 or 100 mm according to the type and re-
sistance class required;
• minimum density 995 kg/m³.
It is generally advisable to rst build the wall and then provide the
opening for the re damper.
EI 120 S Installation within vertical rigid wall
The WKS25 re dampers classied EI 120 S within vertical rigid walls,
guarantee re and heat sealing for 120 minutes only if installed inside
walls with a minimum re resistance class of REI 120, minimum thick-
ness of 100 mm and minimum density of 550 kg/m³.
In accordance with standard EN 1366-2 (Article 13.7) the results of
the tests are extended to thicker or higher density walls.
WKS25 series re dampers can therefore also be installed within walls
made of brick or concrete with a minimum thickness of 100 mm.
Comply with the minimum distances indicated on section Minimum
distances
Single re damper wall opening
A rectangular opening must be provided in the wall with a side 50
mm greater than the nominal size of the re damper. It is advisable
not to exceed by more than 10 mm from the indicated sizes so as not
to compromise the correct thermal insulation.
The use of a reinforcing beam above the opening is recommended
for walls made from concrete blocks, bricks or in concrete cell ele-
ments.
For walls built with perforated elements, it is also recommended that
the area of the opening be made from full elements (for example
aerated concrete blocks) to guarantee the correct adhesion of the
mortar.
Paired re dampers wall opening
A rectangular opening must be provided in the wall with a side 50
mm greater than the nominal size of the paired re dampers:
– Vertically paired re dampers
base = damper base + 50 mm
height = height1 + height2 + 45 mm + 50 mm
– Side by side paired re dampers
base = base1 + base2 + 45 mm + 50 mm
height = damper height + 50 mm.
It is advisable not to exceed by more than 10 mm from the indicated
sizes so as not to compromise the correct thermal insulation.
The use of a reinforcing beam above the opening is recommended
for walls made from concrete blocks, bricks or in concrete cell ele-
ments.
Damper positioning
Lift the xing aps located on the re damper casing. See section
Fixing aps for further details.
Position the damper in the opening so that the side of the closing
mechanism extends from the wall by 185 mm.
Be careful not to damage the intumescent gasket on the outside the
casing.
Secure the re damper to the wall using four screws on the four holes
of the xing aps.
The double test (with the mechanism inside and outside the re
area) demonstrated that there is no preferred direction for the po-
sition of the damper, both in relation to air ow and the side with
the higher probability of exposure to re, as indicated in standard
EN1366-2 (paragraph 6.2).
Filling
It is not necessary to insert any material, but simply cover the gap
between the damper and the wall by applying on face of the wall
mechanism side a layer of plasterboard, to a total minimum thickness
of 12,5 mm, to make a frame 100 mm wide.
B. Nominal base dimension (mm)
H. Nominal height dimension (mm)
1. Plasterboard inll panel, thickness 12,5 mm
EI 120 S Installation in vertical rigid wall - Special cases
Installation in contact with ceiling or oor or side wall
Opening dimensions are as indicated in the previous section.
Apply only three plasterboard layers "U" shaped along the three free
sides of damper.
This installation is allowed for two re dampers paired in battery as
well.
Corner room installation
Opening dimensions are as indicated in the previous section.
Apply two plasterboard layers, to compose a “L” shape on the two
free sides of the fre damper.
This installation is allowed for two re dampers paired in battery as
well.
In case of two side by side paired fre dampers it is necessary to
position the fre dampers with vertical axis, due to the mechanism
presence.
B. Nominal base dimension (mm)
H. Nominal height dimension (mm)
1. Ceiling contact installation
2. Corner room installation
3. Installation wall
4. Ceiling or oor
5. Side vertical wall
6. Plasterboard inll panel, thickness 12,5 mm
EI 120 S Installation within vertical light wall (plasterboard)
The WKS25 re dampers classied EI 120 S within light (plasterboard)
walls guarantee re and heat sealing for 120 minutes only if installed
inside walls with a minimum re resistance class of EI 120 and mini-
mum thickness of 100 mm.
Laboratory test were carried out using 100 mm thick wall with two
plasterboard layers 12,5 mm thick for side and insulated with rock
wool 100 kg/m³ density (optional).
In accordance with standard EN 1366-2 (Article 13.7) the results of
the tests are extended to thicker or higher density walls.

13/15
Comply with the minimum distances indicated on section Minimum
distances
Single re damper wall opening
A rectangular opening must be provided in the wall with a frame
made by metal proles ideal for use with plasterboard (min. thick-
ness 0,6 mm) with a side 75 mm greater than the nominal size of
the damper. It is advisable not to exceed by more than 10 mm from
the indicated sizes so as not to compromise the correct thermal in-
sulation.
The perimeter of the opening must be covered with a layer of plas-
terboard as wide as the thickness of the wall.
Paired re dampers wall opening
A rectangular opening must be provided in the wall with a frame
made by metal proles ideal for use with plasterboard (min. thick-
ness 0,6 mm) with a side 75 mm greater than the nominal size of the
paired dampers:
– Vertically paired re dampers
base = damper base + 75 mm
height = height1 + height2 + 45 mm + 75 mm
– Side by side paired re dampers
base = base1 + base2 + 45 mm + 75 mm
height = damper height + 75 mm.
The perimeter of the opening must be covered with a layer of plas-
terboard as wide as the thickness of the wall.
It is advisable not to exceed by more than 10 mm from the indicated
sizes so as not to compromise the correct thermal insulation.
B. Nominal base dimension (mm)
H. Nominal height dimension (mm)
1. Rock wool, 100 kg/m³
2. Plasterboard inll panel, thickness 12,5 mm
3. Plasterboard thickness 12,5 mm
Damper positioning
Lift the xing aps located on the re damper casing. See section
Fixing aps for further details.
Position the damper in the opening so that the side of the closing
mechanism extends from the wall by 185 mm.
Be careful not to damage the intumescent gasket on the outside the
casing.
Secure the re damper to the wall using four screws on the four holes
of the xing aps.
The double test (with the mechanism inside and outside the re
area) demonstrated that there is no preferred direction for the po-
sition of the damper, both in relation to air ow and the side with
the higher probability of exposure to re, as indicated in standard
EN1366-2 (paragraph 6.2).
Filling
It is not necessary to insert any material, but simply cover the gap
between the damper and the wall by applying on face of the wall
mechanism side a layer of plasterboard, to a total minimum thickness
of 12,5 mm, to make a frame 100 mm wide.
1. Plasterboard inll panel, thickness 12,5 mm
2. Plasterboard inll panel, thickness 12,5 mm
3. Rock wool density up to 100 kg/m³ (optional)
4. Plasterboard thickness 12,5 mm
5. Self-drilling screw Ø 3,5 X 45 mm
EI 120 S Installation within vertical light wall (plasterboard) -
Special cases
Installation in contact with ceiling or oor or side wall
A rectangular opening must be provided in the wall with the three
sides made by metal proes ideal for use with plasterboard. The side
parallel to the ceiling or to the wall 75 mm greater than the nominal
sizes of the damper and the side perpendicular to the ceiling or to
the floor 63 mm greater than the nominal sizes of the damper.
The three metal proles must be covered with a plasterboard layer
12,5 mm thick, as wide as the the thickness of the wall.
No need to apply anything on the wall or on the ceiling.
Just apply three plasterboard layers, to compose a “U” shape on the
three free sides of the fre damper.
This installation is allowed for two re dampers paired in battery as
well.
Corner room installation
A rectangular opening must be provided in the wall with the two
sides made by metal proes ideal for use with plasterboard. The
opening size must be 63 mm greater than the nominal sizes of the
damper.
The two metal proles must be covered with a plasterboard layer
12,5 mm thick, as wide as the the thickness of the wall.
No need to apply anything on the wall or on the ceiling.
Apply two plasterboard layers, to compose a “L” shape on the two
free sides of the fre damper.
This installation is allowed for two re dampers paired in battery as
well.
In case of two side by side paired fre dampers it is necessary to
position the fre dampers with vertical axis, due to the mechanism
presence.

14/15
B. Nominal base dimension (mm)
H. Nominal height dimension (mm)
1. Ceiling contact installation
2. Corner room installation
3. Plasterboard inll panel, thickness 12,5 mm
4. Installation wall
5. Ceiling or oor
6. Side vertical wall
EI 90 S Installation within vertical light wall (gypsum blocks wall)
The WKS25 re dampers classied EI 90 S within vertical light walls
built with gypsum blocks "carreaux de plâtre", guarantee re and
heat sealing for 90 minutes only if installed inside walls with a mini-
mum re resistance class of EI 90, minimum thickness of 70 mm and
minimum density of 995 kg/m³.
In accordance with standard EN 1366-2 (Article 13.7) the results of
the tests are extended to thicker or higher density walls.
Comply with the minimum distances indicated on section Minimum
distances
Wall opening
A rectangular opening must be provided in the wall with a side 50
mm greater than the nominal size of the re damper.
It is advisable not to exceed by more than 10 mm from the indicated
sizes so as not to compromise the correct thermal insulation.
Damper positioning
Lift the xing aps located on the re damper casing. See section
Fixing aps for further details.
Position the damper in the opening so that the side of the closing
mechanism extends from the wall by 202 mm.
Be careful not to damage the intumescent gasket on the outside the
casing.
Secure the re damper to the wall using four screws on the four holes
of the xing aps.
The double test (with the mechanism inside and outside the re
area) demonstrated that there is no preferred direction for the po-
sition of the damper, both in relation to air ow and the side with
the higher probability of exposure to re, as indicated in standard
EN1366-2 (paragraph 6.2).
Filling
It is not necessary to insert any material, but simply cover the gap
between the damper and the wall by applying on face of the wall
mechanism side a layer of plasterboard, to a total minimum thickness
of 12,5 mm, to make a frame 100 mm wide.
B. Nominal base dimension (mm)
H. Nominal height dimension (mm)
1. Plasterboard inll panel, thickness 12,5 mm
2. Self-drilling screw Ø 3,5 X 45 mm
EI 120 S Installation within vertical light wall (gypsum blocks wall)
The WKS25 re dampers classied EI 120 S within vertical light walls
built with gypsum blocks“carreaux de plâtre”, guarantee re and heat
sealing for 120 minutes only if installed inside walls with a minimum
re resistance class of EI 120, minimum thickness of 100 mm and
minimum density of 995 kg/m³.
In accordance with standard EN 1366-2 (Article 13.7) the results of
the tests are extended to thicker or higher density walls.
Comply with the minimum distances indicated on section Minimum
distances
Single re damper wall opening
A rectangular opening must be provided in the wall with a side 50
mm greater than the nominal size of the re damper.
It is advisable not to exceed by more than 10 mm from the indicated
sizes so as not to compromise the correct thermal insulation.
Paired re dampers wall opening
A rectangular opening must be provided in the wall with a side 50
mm greater than the nominal size of the paired re dampers:
– Vertically paired re dampers
base = damper base + 50 mm
height = height1 + height2 + 45 mm + 50 mm
– Side by side paired re dampers
base = base1 + base2 + 45 mm + 50 mm
height = damper height + 50 mm.
It is advisable not to exceed by more than 10 mm from the indicated
sizes so as not to compromise the correct thermal insulation.
Damper positioning
Lift the xing aps located on the re damper casing. See section
Fixing aps for further details.
Position the damper in the opening so that the side of the closing
mechanism extends from the wall by 185 mm.
Be careful not to damage the intumescent gasket on the outside the
casing.
Secure the re damper to the wall using four screws on the four holes
of the xing aps.
The double test (with the mechanism inside and outside the re
area) demonstrated that there is no preferred direction for the po-
sition of the damper, both in relation to air ow and the side with
the higher probability of exposure to re, as indicated in standard
EN1366-2 (paragraph 6.2).
Filling
It is not necessary to insert any material, but simply cover the gap
between the damper and the wall by applying on face of the wall
mechanism side a layer of plasterboard, to a total minimum thickness
of 12,5 mm, to make a frame 100 mm wide.

15/15
B. Nominal base dimension (mm)
H. Nominal height dimension (mm)
1. Plasterboard inll panel, thickness 12,5 mm
2. Self-drilling screw Ø 3,5 X 45 mm
EI 120 S Installation within vertical light wall (gypsum blocks wall)-
Special cases
Installation in contact with ceiling or oor or side wall
Opening dimensions are as indicated in the previous section.
Apply only three plasterboard layers "U" shaped along the three free
sides of damper.
This installation is allowed for two re dampers paired in battery as
well.
Corner room installation
Opening dimensions are as indicated in the previous section.
Apply two plasterboard layers, to compose a “L” shape on the two
free sides of the fre damper.
This installation is allowed for two re dampers paired in battery as
well.
In case of two side by side paired fre dampers it is necessary to
position the fre dampers with vertical axis, due to the mechanism
presence.
1. Ceiling contact installation
2. Corner room installation
3. Plasterboard inll panel, thickness 12,5 mm
4. Installation wall
5. Ceiling or oor
6. Side vertical wall
Installation within vertical light wall (Shaft wall)
WKS25 re dampers are tested and approved in:
Fire resistance classication Hole size“D1 x D2”
[mm]
Damper protrusion from
the wall“E”
[mm]
Wall minimum thickness“S”
[mm] Sealing
EI 90 S Installation within vertical light wall (Shaft wall)
EI 90 S
(300 Pa) (B+90) x (H+90) 185 90 Plasterboard inll panel, thickness 20 mm
B Nominal base of the damper
H Nominal height of the damper
Refer to the section Construction supports characteristics for further
information.
Comply with the minimum distances indicated on section Minimum
distances .
Wall opening
A opening must be provided in the wall as indicated in the table and
in the drawing
Damper positioning
Position the damper in the opening so that the side of the closing
mechanism extends as indicated in the table and in the drawing.
Filling
It is not necessary to insert any material, but simply cover the gap
between the damper and the wall by applying on face of the wall
mechanism side a layer of plasterboard, to a total minimum thickness
of 20 mm, to make a frame 75 mm wide.
B. Nominal base dimension (mm)
H. Nominal height dimension (mm)
1. Plasterboard thickness 20 mm
2. Plasterboard inll panel, thickness 20 mm
3. Metal frame
4. Self-drilling screw Ø 3,5 X 70 mm