Technical details

  • maintenance-free
  • CE marking
  • Environmental Product Declaration (EPD)
  • Hygiene certificate
  • can be combined with the communication system Wildeboer-Net


Environmental Product Declaration (EPD)
Hygiene certificate
Lorem Ipsum

Product details

Maintenance-free FK90 fire dampers conform the European Product Standard EN 15650 and have the CE marking. Series FK92 can be used for a fire resistance period of 30/60/90 minutes, series FK120 can be used for a fire resistance period up to 120 minutes.

All-purpose installation variants - in, on and remote from rigid walls and ceilings as well as in and remote from metal stud walls, in fire walls and in shaft walls with and without metal studs, in walls and ceilings made of wood, in steel frame ceilings - provide maximum planning reliability. The equipment can be installed with the shut-off damper blade axis in the horizontal or vertical position. Incoming air flow can be on any connection side. FK90 fire dampers are suitable for attachment to ventilation ducts, including those made of combustible materials. With a protective grille on both sides and in conjunction with a smoke detector, the FK90 fire damper can also be used for overflow opening (Ü-FK). A design suitable for commercial kitchens or for wooden constructions is available in addition. Offered in sizes from 200 mm x 200 mm to 1500 x 800 mm (W x H), in 5 mm increments.

The airtight casing, with leak tightness class C according to EN 1751, is made of galvanized steel, with wear-resistant calcium silicate damper blade. The enclosed release elements are activated at 70°C or 95°C. The actuators can be operated manually or electrically and are also available in explosion-proof design.

This product has an Environmental Product Declaration (EPD),  has been awarded the hygiene certificate and complies with ATEX-Equipment Directive 2014/34/EU.

Further information about these topics can be found on the pages Environmental Product Declaration (EPD), Hygiene Certificate and ATEX Product Directive 2014/34/EU.

Why fire dampers by Wildeboer are truly maintenance-free!

Technical specifications

The specified values for width and height are standard values. They can be produced for widths of 200 - 1500 mm and heights of 200 - 1000 mm in 5 mm increments. Not all of the variant values listed here can be combined with each other. Use our Wildeboer configurator to easily check the possible combinations.

  • 200 mm
  • 225 mm
  • 250 mm
  • 275 mm
  • 300 mm
  • 325 mm
  • 350 mm
  • 375 mm
  • 400 mm
  • 450 mm
  • 500 mm
  • 550 mm
  • 600 mm
  • 650 mm
  • 700 mm
  • 750 mm
  • 800 mm
  • 850 mm
  • 900 mm
  • 950 mm
  • 1000 mm
  • 1050 mm
  • 1100 mm
  • 1150 mm
  • 1200 mm
  • 1250 mm
  • 1300 mm
  • 1400 mm
  • 1500 mm
  • 200 mm
  • 225 mm
  • 250 mm
  • 275 mm
  • 300 mm
  • 325 mm
  • 350 mm
  • 375 mm
  • 400 mm
  • 450 mm
  • 500 mm
  • 550 mm
  • 600 mm
  • 650 mm
  • 700 mm
  • 750 mm
  • 800 mm
  • 850 mm
  • 900 mm
  • 950 mm
  • 1000 mm
Casing design
  • Without corrosion protection
  • With corrosion protection
Damper blade design
  • With frame made of galvanized steel
  • With frame made of stainless steel
  • Metal cover made of galvanized steel
  • Metal cover made of stainless steel
Limit switch
  • Without limit switch
  • Closed
  • Open
  • Open/closed
  • Closed (Ex)
  • Open (Ex)
  • Open/closed (Ex)
Release temperature
  • 70°C
  • 70°C (with corrosion protection)
  • 95°C (with corrosion protection)
Smoke detection
  • Without smoke detection
  • With OR32 smoke detector
  • Mit Rauchauslöseeinrichtung OR4
  • in massive Wand
  • in massive Decke
  • in Metallständerwand
  • an massive Wand
  • entfernt von massiver Wand
  • entfernt von Metallständerwand
  • entfernt von massiver Decke
  • an massive Decke
  • in Wand massiver Holzbauweise
  • in Decke massiver Holzbauweise
  • in Schachtwand
  • in Brand/-Sicherheitstrennwand
  • in Wand in Holzrahmenbauweise
  • in Decke in Holzrahmenbauweise
  • in Decke mit Stahlrahmen
  • in Sockel auf massiver Decke
  • auf Sockel auf massiver Decke
  • mit Mineralwolle
  • mit Mörtel
  • mit teilweiser Ausmörtelung
  • mit eckigem Einbaurahmen ER1
  • mit eckigem Einbaurahmen ER3
  • mit eckigem Einbaurahmen ER2
  • mit eckigem Einbaurahmen ER4
  • mit eckigem Anbaurahmen AR1
  • mit eckigem Anbaurahmen AR2
  • mit eckigem Einbaurahmen ER8
  • mit Weichschott
  • thermisch mechanisch
  • motorisch 24 V
  • motorisch 230 V

Product pictures

FK90 fire damper half right from the front
FK90 fire damper right side
FK90 fire damper half left from the rear
FK90 fire damper from behind
FK90 fire damper half right from the rear
FK90 fire damper left side
FK90 fire damper half left from the front
FK90 fire damper from the front
FK90 fire damper with ER1 installation frame half right from the front
FK90 fire damper with ER8 installation frame half right from the front

3D view

Here you can view the FK90 fire damper, series FK92, as a 3D model.

Media & Downloads

Declaration of performance FK90 fire damper, series FK92 (2018-08)
User manual FK90 fire damper – series FK92 (2021-06)
Operating manual FK90 fire damper, series FK92 (2021-06 / DE)
EU-declaration of conformity EX FK90 firedamper (2021-03 / DE)
Hygiene certificate FK90 firedamper (2008-12 / DE)
Environmental product declaration (EPD) FK90 fire damper (2018-11 / DE)
User manual OR32 (2020-11 / DE)
Approval Ü-FK, series OR32 & OR4, Z-6.50-2132 (2023-08 / DE)
Operating manual OR32 (2020-11 / DE)
Certificate fire behaviour verification FK90, FR90, FK90K, BV90 (2021-04 / DE)
Hygiene certificate flexible connection (2022-08)

Installation and mounting subframes FK90

  • made of calcium silicate
  • for simplified dry installation flexible walls cladded on both sides in shaft walls with or without metal stud
  • Length of the fire damper: L = 400 mm, L = 500 mm
  • made of calcium silicate for flexible walls cladded on both sides and for shaft walls with or without metal stud.
  • Length of the fire damper:  L = 355 mm
  • made of calcium silicate for sliding ceiling connections in metal stud walls with drop up to 40 mm cladded on both sides.
  • Length of the fire damper:  L = 500 mm
  • made of calcium silicate
  • for dry installation in wooden walls and wooden ceilings and for ceilings with steel frames
  • Length of the fire damper:  L = 400 mm, L = 500 mm
  • made of calcium silicate for direct screwing on rigid walls and ceilings.
  • Particularly well-snited for restoring missing fire dampers.
  • Length of the fire damper:  L = 346 mm
  • made of calcium silicate for installation remote from rigid walls and ceilings as well as metal stud walls cladded on both sides.
  • Length of the fire damper:  L = 400 mm, L = 500 mm

Electrical spring return actuator

  • Default actuator of FK90
  • Default actuator of FR90 to DN 315
  • Runtime: Opening ≈ 60 s, closing ≈ 21 s.
  • CLOSED/OPEN position indicators via limit switches
  • Runtime: Opening < 60 s, closing ≈ 20 s.
  • CLOSED/OPEN position indicators via limit switches
  • FK90: for sizes B ≤ 800 mm and H ≤ 450 mm only
  • Default actuator of FK90K
  • Runtime: Opening < 60 s, closing ≈ 20 s.
  • CLOSED/OPEN position indicators via limit switches
  • Runtime: Opening ≈ 30 s, closing ≈ 10 s.
  • CLOSED/OPEN position indicators via limit switches

Thermal-mechanical release mechanism (TMR)

  • with 70°C release element
  • with coated 70°C release element
  • with coated 95°C release element
  • optional with limit switch

E-EX with normally closed contact and normally open contact

  • G24 with lifting solenoid 24 V DC
  • W220 with lifting solenoid 230 V AC
  • P/P2 with lift cylinder
  • GU24 with magnetic clamp 24 V DC
  • WU220 with magnetic clamp 230 V AC


The 92 series fire dampers are maintenance-free. Due to their design and the materials used, such as the complete encapsulation of the actuator mechanics, the thermal release device, the motorized actuators, etc., they can do without ongoing maintenance work to maintain their function. Periodic lubrication, for example, is not required. Maintenance is thus limited to functional checks (triggering and reopening of the fire dampers) or repair measures in the event of damage. Hygienic cleaning must be carried out as part of the overall cleaning of the ventilation and air-conditioning system or as required. 

Due to the fact that the system is maintenance-free, functional checks may also be carried out remotely. This can be carried out particularly easily and economically via the Wildeboer BS2 communication system for fire dampers with automatic calendar control.

For this purpose, the shut-off damper blade of the fire damper must be closed and opened again. The fire damper can be equipped with different release devices or with electric spring return motors for opening and closing.

For the function test, the manual release must be operated or a remote release must be performed to close the shut-off damper blade of the fire damper. Afterwards, the shut-off damper blade must be opened again.

The respective commissioning and function control measures as well as notes on operation are described in the operating instructions.

You can find our operating instructions in the download area.

When it comes to the functioning and operation of fire dampers in accordance with DIN EN 15650, there are several specifications and obligations that must be complied with. We have summarized the essentials in a document that you can view and download here.

If the fire damper cannot be opened, the fusible link sleeve or the thermoelectric fusible link must be checked for integrity. These must be in proper condition and must not show any damage. Refer to the respective operating instructions for the design and replacement.

In addition, no installed parts may obstruct or block the damper blade freewheeling.

If these measures do not work, please contact our technical support.

You will find our operating instructions in the download area.

A minimum distance to adjacent walls and ceilings is not required when installing square fire dampers from Wildeboer Bauteile GmbH. Only a small distance is required for the round fire damper FR90.

The corresponding specifications can be found in the respective user manuals.

Yes. The FK90 and FR90 fire dampers have a certificate of conformity for use in explosion-proof areas. They are available with mechanical release device or electric spring return motor.

We have summarized details on the handling of fire dampers with asbestos-containing building materials for you in this document (german).

No. The fire dampers each have two inspection openings. These allow a view into the interior of the fire damper, on both sides of the damper blade. Inspection openings can be ordered as an option for the FK90 fire damper. These do not replace openings of corresponding size, which must be provided for cleaning purposes based on relevant standards and guidelines.

Yes, the AMP connectors can be removed.

Yes. The fire dampers are equipped with an electric spring return motor or a thermal-mechanical release device (TMA) at the factory. A fire damper equipped with a TMA at the factory can be retrofitted with a spring return motor. Complete actuator units for the particular damper type are required for the retrofit. These include the motor console, the spring return motor and the electric fusible link.

Yes, it is possible to retrofit a limit position switch for both the open and closed positions of the fire damper. Spring return motors have both limit switches as standard.

An elastic connector, also called an expansion compensator or canvas connector, is suitable for installation between a ventilation duct and components of a ventilation system, e.g. a fire damper. It can absorb changes in the length of the connected duct, burn off in the event of a fire and thus prevent the transmission of force from the ventilation duct to the fire damper.

FK90, FR90 (FR92 and FR92K series) and FK90K fire dampers are CE marked construction products according to the harmonized product standard DIN EN 15650. They can be connected on one or both sides to ventilation ducts made of non-combustible or combustible building materials. In the event of fire, thermal expansion of these ducts must not exert any significant forces on the fire damper. Compensatory measures must be provided in accordance with local requirements. In Germany, the "Guideline on Fire Protection Requirements for Ventilation Systems", or "Ventilation System Guideline - LüAR" for short, contains building code requirements for implementation and necessity. In general, compensation is achieved by suitable pipe routing. There is no general requirement for the use of flexible connectors. 

In addition, when using the FK90 fire damper for commercial kitchens, the specifications of the general building inspection approval Z41.3-670 must be observed. Ventilation ducts made of galvanized or stainless steel must be connected. For the installation of the ventilation duct and limitation of forces, the above-mentioned guideline must also be referred to.

In addition, ventilation ducts on FK90 fire dampers for commercial kitchens are in accordance with the building authority approval

  • in metal stud walls 
  • in walls made of gypsum wallboards 

via suitable elastic connectors (expansion compensators) made of combustible building materials, at least building material class B2 according to DIN 4102-1. An expansion allowance of ≥ 100 mm in the installed state is required.

On 01 July 2013, the European Construction Products Regulation (CPD, No. 305/2011) came into full force in all EU member states after a transitional period and replaced the Construction Products Directive (CPD, No. 89/106/EEC).

Newly produced fire dampers that fall under the harmonized product standard EN 15650 must already be marked with the CE conformity mark since 01 September 2012. Since July 01, 2013, the manufacturer has also been required to submit a declaration of performance (DoP). He thus assumes responsibility for the conformity of the fire damper with the declared performance. The declarations of performance are available for:

As a result, Deutsches Institut für Bautechnik (DIBt) may no longer issue or extend general building inspectorate approvals (abZ) for fire dampers that fall under the harmonized product standard EN 15650 and must therefore bear a CE marking. They may no longer be required as proof of usability for national construction projects.

The information required for installation and assembly is fully described in the comprehensive user manuals.

Overflow openings ensure the flow of air between two nearby rooms, e.g. for the ventilation of interior corridors and rooms or for air supply. If overflow openings are provided in fire-resistant walls or ceilings, it must be possible to close them properly. Fire dampers with a smoke release device without connection to a ventilation duct are used here. In the event of a fire, they close the opening and thus prevent the spread of fire and smoke. With the FK90 and FR90 fire damper in combination with OR4 or the OR32 smoke release device, Wildeboer offers solutions with the necessary general type approval from the German Institute for Building Technology, which is required for use in Germany.