FKRS-EU

FKRS-EU with fusible link for 72 °C or 95 °C

CE compliant according to European regulations

With TROXNETCOM as an option

ATEX certification

Conforms to VDI 6022

FKRS-EU

Compact dimensions – ideal for restricted spaces

Small circular fire damper for shutting off air ducts between 2 fire compartments, available in 10 nominal sizes
■ Nominal sizes: 100 – 315 mm
■ Low differential pressure and sound power level
■ Optional as explosion-proof variant (ATEX)
■ Optional as air transfer damper with fusible link
■ Optional as air transfer damper
■ Optional with stainless steel casing or powder-coated casing for increased corrosion protection
■ Integration into MCE/BACS with TROXNETCOM
■ Universal installation options

Optional equipment and accessories
■ Electric actuator 24 V/230 V
■ Release temperature 72/95 °C

Useful additions
■ Duct smoke detectors

Initialize order code

General information

Application

Fire dampers with CE marking and declaration of performance, for the isolation of duct penetrations between two fire compartments in the event of a fire
To prevent the propagation of fire and smoke through ductwork to adjacent designated fire compartments

Special characteristics

Declaration of Performance according to the European Construction Products Regulation
Classification up to EI 120 (ve, ho, i ↔ o) S according to DIN EN 13501-3
Certified mortar-based installation with reduced distances of 40 mm to load-bearing components or at least 10 mm between 2 fire dampers
Circumferential gap dimensions in the mortar-based installation up to 225 mm permitted
Installation also possible in walls and ceilings with slope
Complies with European product standard DIN EN 15650
Tested for fire resistance properties in accordance with EN 1366-2 (300 Pa and 500 Pa negative pressure)
Meets the hygienic requirements according to VDI 6022-1, VDI 3803-1, DIN 1946-4, DIN EN 16798-3 as well as Ö-Norm H 6020 and H 6021 and SWKI
Corrosion protection according to DIN EN 15650 in connection with DIN EN 60068-2-52
Closed blade leakage airflow to EN 1751, class 3
Casing air leakage to EN 1751, class C
Low differential pressure and sound power level
Any airflow direction
Integration into the MCE with TROXNETCOM
Integration into the MCE with the international standard fire damper system according to IEC 62026-2 with AS-interface is possible

Classification

Performance class up to EI 120 (ve, ho, i ↔ o) S according to DIN EN 13501-3

Nominal sizes

100, 125, 150, 160, 180, 200, 224, 250, 280, 315
L: 400 mm

Variants

with fusible link
with spring return actuator
with spring return actuator for use in potentially explosive atmospheres
with spring return actuator with duct smoke detector RM-OM
with cover grille on both sides as air transfer damper (FD)
As an air transfer damper with spring return actuator, duct smoke detector and cover grille on both sides according to General construction technique permit Z-6.50-2516

For installation in Germany, please note: if a fire damper with only a mechanical shut-off element (fusible link) is to be used as an air transfer damper (FD), the local building regulations apply.

The use of such air transfer dampers (FD) is usually limited to pressure differential systems.

Parts and characteristics

Release temperature 72 °C or 95 °C (for use in warm air ventilation systems)
Single-handed operation
Installation orientations from 0° - 360
Explosion-proof constructions for zones 1, 2, 21, 22

Attachments

Limit switch for damper blade position indication
Spring return actuator with 24 V AC/DC or 230 V AC supply voltage
Spring return actuator for 24 – 230 V supply voltage, for use in potentially explosive atmospheres
Network module for integration in AS-i networks, MODBUS RTU and BACnet MS/TP (RS485)
Spring return actuator and pre-wired RM-O-M smoke detector with 230 V AC or 24 V DC supply voltage for use in air ducts
Spring return actuator and pre-wired RM-O-3-D smoke detector with 230 V AC or 24 V DC supply voltage for use as air transfer damper (MFD)
All attachments can also be retrofitted

Accessories

Installation block ER for dry mortarless installation in solid walls and ceilings
Installation kit TQ2 for dry mortarless installation in solid walls, in lightweight partition walls/compartment walls with metal support structure and cladding on both sides, in shaft walls with and without metal support structure, in timber stud walls, half-timbered construction and solid wood walls and in solid wood ceilings and wooden beam ceilings and wooden panel elements
Installation kit TS2 for dry mortarless installation of 2 FKRS-EU in solid wood ceilings (one installation opening as twin installation)
Installation kit WA2 for dry mortarless installation in solid walls as well as in single-sided shaft walls with and without metal stud framing
Installation kit WE2 for dry mortarless installation away from solid walls and ceilings as well as away from lightweight walls with metal stud frame cladding on both sides
Installation kit GL2 for installation in lightweight partition walls/fire walls with flexible ceiling joint and for dry mortarless installation in lightweight partition walls with metal stud framing on both sides during wall construction
Cover grille
Flexible connectors
Extension piece

Useful additions

Duct smoke detector RM-O-3-D
Duct smoke detector with airflow monitor RM-O-O-M

Construction features

Stable, circular casing suitable for push fitting into drilled cut holes without additional drilling and chiselling being required
Spigot connections with lip seal on both sides, suitable for ventilation ducts according to EN 1506 or EN 13180 plus non-standard but commercial nominal sizes 180, 224 and 280
Suitable for the connection of ducts, cover grilles or flexible connectors
The release mechanism is accessible and can be tested from the outside
One inspection access panel
Remote control with spring return actuator

Standards and guidelines

EU Construction Products Regulation
EN 15650 Ventilation for buildings – Fire dampers
DIN EN 1366-2 Fire resistance tests for service installations – Fire dampers
EN 13501-3 Fire classification of construction products and building elements
DIN EN 1751: Ventilation for buildings – Air terminal devices
2006/42/EC – Machinery Directive
2014/34/EU – ATEX Directive

Material and surfaces
Casing:

Galvanised sheet steel
Galvanised sheet steel, powder-coated RAL 7001
Stainless steel 1.4301

Damper blade:

Special insulation material
Special insulation material with impregnation
Replaceable damper blade (from NS 180 mm)

Other components:

Damper blade shaft made of galvanised steel or stainless steel
Elastomer seals

The design variants made of stainless steel or with powdercoated casings meet increased requirements for corrosion protection. Detailed resistance lists upon request.

Supply package

If attachments and accessories are factory-mounted on the fire dampers, they are already included in the order code. Depending on the installation situation, additional materials such as mortar, screws or mineral wool may be required for correct installation. Such materials are not usually included in the supply package (unless stated otherwise). Attachments and accessories have to be selected by people in charge of the building project. These people also have to select and provide any additionally required installation or fixing materials and make sure that the required classifications are met.

Maintenance

At the instigation of the owner of the ventilation system, the functional test of the fire damper must be carried out at least every six months, taking into account the basic maintenance measures in accordance with DIN EN 13306 in conjunction with DIN EN 31051. If two consecutive tests, one six months after the other, are successful, the next test can be conducted one year later.
A functional test involves closing the damper blade and opening it again; with a spring return actuator, this function can be done via a remote control
Fire dampers must be included in the regular cleaning schedule for the ventilation system.
For details on functional tests, maintenance and inspection refer to the operating and installation manual

Technical data

Nominal sizes: 100 to 315 mm
Casing length: 400 mm
Volume flow range: up to 770 l/s (2770 m³/h)
Differential pressure range: up to 1500 Pa
Temperature range: -20 - 50 °C *
Upstream velocity **:

Standard construction ≤ 8 m/s
Variant with spring return actuator ≤ 10 m/s
Variant with explosion-proof actuator ExMax/ RedMax-15-BF TR ≤ 10 m/s

* For FKRS-EU in Ex variant, see supplementary operating manual

** Data applies to uniform upstream and downstream conditions of the fire dampers

Correct use

The fire damper is used as an automatic shut-off device to prevent fire and smoke from spreading through the air duct
The fire damper is suitable for supply and extract air in ventilation and air conditioning systems
The fire damper may be used in areas with potentially explosive atmospheres if suitable special accessories are used and if the product bears the CE conformity marking according to Directive 2014/34/EU. Fire dampers for use in areas with potentially explosive atmospheres are marked for the zones for which they have been approved
Operation of fire dampers is allowed only in compliance with installation regulations and the technical data in the installation and operating manual
Modifying the fire damper or using spare parts that have not been approved by TROX is not permitted

Incorrect use:

Without specially approved attachments in areas with potentially explosive atmospheres
As a smoke control damper
Outdoors without sufficient protection against weather effects
In atmospheres where chemical reactions, whether planned or unplanned, may cause damage to the fire damper or lead to corrosion

For installation in Germany, please note:

Do not use in extract air systems in commercial kitchens
Use as an air transfer damper (MFD) only in accordance with General construction technique permit Z-6.50-2516
Use with a combined penetration seal requires projectrelated type-approval.
Installation in the fire protection block bulkhead only with project-related type approval
The use of air transfer dampers (FD) may require a building inspectorate licence. This must be checked and applied for by the client.
Flame-resistant, non-dripping building materials (elastomeric foams) must at least comply with fire rating class C - s2, d0 in accordance with the specifications of the German M-VV TB (since 2019/01) guideline. The current national building regulations apply.

Technical information

Construction with fusible link

1 Casing
2 Fusible link
3 Damper blade with ring seal
4 Inspection access (12 mm)
5 Lip seal
6 Handle and damper blade position indicator
7 Travel stop for CLOSED position
8 Thermal release device

In the event of a fire, fire dampers shut automatically to prevent the propagation of fire and smoke through air ducts to adjacent designated fire compartments. In the event of a fire, the damper is triggered at 72 °C or at 95 °C (use in warm air ventilation systems) by a fusible link. The release mechanism is accessible and can be tested from the outside. One or two limit switches (optional attachment) can be used to indicate the damper blade position.

Nominal sizes	100 – 315 mm
Casing length	400 mm
Volume flow rate range	up to 770 l/s / to 2770 m³/h
Differential pressure range	up to 1500 Pa
Temperature range ¹, ³, ⁴	-20 to 50 °C
Release temperature	72 °C or 95 °C (for warm air ventilation systems)
Upstream velocity ²	≤ 8 m/s with standard version; ≤ 10 m/s version with spring return actuator

¹ Temperatures may differ for units with attachments. Details for other applications are available on request.

² Data apply to uniform upstream and downstream conditions of the fire dampers

³ For FKRS-EU in Ex version, see supplementary operating instructions

⁴ Non-condensing operation and without moisture entry via the outdoor air intake.

Free cross sections and Zeta values

	NS
	100	125	150	160	180	200	224	250	280	315
A [m²]	0.005	0.009	0.014	0.016	0.021	0.027	0.033	0.042	0.053	0.069
ζ	1.71	1.08	0.76	0.67	0.54	0.44	0.56	0.45	0.36	0.28

This specification text describes the general properties of the product. Texts for variants can be generated with our Easy Product Finder design programme.

Specification text

Circular fire damper that meets the requirements of the European product standard EN 15650. Tested for fire resistance properties to EN 1366-2 (negative pressure of 300 Pa and 500 Pa), with CE marking.

With the Declaration of Performance (DoP), the fire damper manufacturer provides evidence of the respective installation conditions, such as in, on and away from walls or ceilings, with

the essential features such as size, supporting structure, type of construction and installation and the respective associated performance classes according to classification standard DIN EN

13501-3.

The ready-to-use unit contains a release device and a replaceable, fire-resistant damper blade that can be arranged with installation position 0 - 360 degrees depending on the use.

Classification (depending on application):

EI 30 (ve, ho i ↔ o) S to EI 120 (ve, ho i ↔ o) S.

Suitable for:

Mortar-based installation

In solid walls, also with partial mortar lining, as well as in walls made of gypsum wallboards
In non-load-bearing solid walls with flexible ceiling joint
In lightweight walls, fire walls, safety partition walls and radiation shielding walls with metal studs or steel support structure and cladding on both sides
In timber stud walls and timber frame walls as well as in solid wood and cross laminated timber walls
In shaft walls with metal support structure and cladding on one side
In solid ceilings and in concrete bases on solid ceilings
In hollow core ceilings, hollow block slab, composite ceilings and ribbed ceilings
In solid ceiling with a FireShield® (In Germany: building approval required)
In combination with wooden beam ceilings, solid wood ceilings and lightweight ceilings (Cadolto and ADK Modulraum systems)
In solid wood and wooden beam ceilings, historic wooden beam ceilings as well as wooden surface elements
Combined installation with FK2-EU in solid walls and ceilings, lightweight partition walls, shaft walls as well as timber stud walls and timber frame walls (up to 1.2 m² total fire damper area)
Multiple occupancy up to 1.2m² total fire damper area in solid walls and ceilings, lightweight partition walls as well as shaft walls

Dry mortarless installation

In solid walls and ceilings with installation block ER
In solid walls, lightweight partition walls, fire walls, safety partition walls and radiation shielding walls with metal stud frame or steel substructure and cladding on both sides, with installation kit TQ2
Dry mortarless installation without installation kit in lightweight partition walls with metal support structure and cladding on both sides
In lightweight partition walls with metal support structure and cladding on both sides, with installation kit GL2 during wall construction
In lightweight partition walls and compartment walls with metal support structure, cladding on both sides and flexible ceiling joint, with installation kit GL2
In timber stud walls and half-timbered walls with cladding on both sides, also in solid wood walls, with installation kit TQ2
In shaft walls with or without metal support structure and cladding on one side, with installation kit TQ2
On solid walls as well as on shaft walls with and without metal studs and cladding on one side, with installation kit WA2
In solid wood and wooden beam ceilings as well as wooden surface elements with installation kit TQ2
Installation kit TS2 for dry mortarless installation of 2 FKRS-EU in solid wood ceilings (one installation opening as twin installation)
Away from solid walls and ceilings (horizontal ducting) and away from lightweight partition walls with metal support structure and cladding on both sides, with installation kit WE2
Away from solid walls, lightweight partition walls with metal studs and cladding on both sides, as well as timber stud walls and half-timbered walls and solid wood walls with mineral wool insulation

Coated board system installation

In solid walls and ceilings with coated board system, also multiple occupancy
In lightweight walls, fire walls, safety partition walls and radiation protection walls with metal studs or steel substructure and cladding on both sides, also multiple occupancy, as well as in shaft walls with metal studs with coated board system
In timber stud and timber frame walls and cladding on both sides, also multiple occupancy, as well as solid timber walls with coated board system

Other (in Germany: buidling approval required)

In solid walls, lightweight walls with metal and wooden studs, solid wood walls and sandwich panels with HILTI fire protection blocks CFS-BL (stone bulkhead)
Mixed installation with cable and pipe penetrations (combined penetration seal) in solid walls, lightweight walls with metal and wooden studs and solid wood walls
Mixed installation with cable penetrations in HILTI fire stop blocks CFS-BL (stone bulkhead) in solid walls, lightweight walls with metal and wooden studs, solid wood walls and sandwich panels

Sizes: 100, 125, 150, 160, 180, 200, 224, 250, 280, 315 mm

Optimised low-leakage casing, up to leakage class C to EN 1751 with low differential pressure and low sound power level. Damper casing made of galvanised sheet steel, optionally galvanised sheet steel with powder coating RAL 7001, or stainless steel 1.4301. Damper blade made of special insulating material, optionally with impregnation. Corrosion protection according to EN 15650 in connection with EN 60068-2-52 Meets the hygienic requirements according to VDI 6022-1, VDI 3803-1, DIN 1946-4, EN 16798-3 as well as Ö-Norm H 6020 and H 6021, and SWKI.

Casing length 400 mm, for the connection to ducts made of noncombustible or combustible materials. Thermal release at 72 °C or 95 °C (warm air ventilation systems) with a fusible link or thermoelectrically with a spring return actuator, push button and indicator light (LED). Versions with a brushless spring return actuator for opening and closing the fire damper, also when the ventilation system is running and regardless of the nominal size, are particularly suitable for functional checks or daily shut-offs of duct sections. A spring return actuator can be retrofitted from the outside without modifying the linkage. Explosion-proof constructions for zones 1, 2, 21 and 22 with spring return actuator.

Special features

Declaration of Performance according to the European Construction Products Regulation
Classification according to DIN EN 13501-3, up to EI 120 (ve, ho i ↔ o) S
Complies with European product standard DIN EN 15650
Tested for fire protection properties in accordance with EN 1366-2 (300 Pa and 500 Pa negative pressure)
Certified mortar-based installation with reduced distances of 40 mm to load-bearing components or 10 mm between 2 fire dampers
Circumferential gap dimensions in the mortar-based installation up to 225 mm permitted
Installation also possible in walls and ceilings with slope
Inspection access (12 mm)
Meets the hygienic requirements according to VDI 6022-1, VDI 3803-1, DIN 1946-4, DIN EN 16798-3 as well as Ö- Norm H 6020 and H 6021 and SWKI
Corrosion protection according to DIN EN 15650 in connection with DIN EN 60068-2-52
Closed blade leakage airflow to EN 1751, class 3
Casing air leakage to EN 1751, class C
Low differential pressure and sound power level
Any airflow direction
Integration into the MCE with the international standard fire damper system according to IEC 62026-2 with AS-interface is possible

Order code FKRS-EU

FKRS-EU

–

200

TQ2

ZL10

1 Type

FKRS-EU Fire damper

2 Casing variant

No entry: standard construction

1 Powder-coated casing, RAL 7001 (silver grey)

2 Stainless steel casing

3 Damper blade variant

No entry: standard variant

7 impregnated damper blade

4 Fusible link/thermoelectric release device

No entry: 72 °C release temperature

W¹ 95 °C release temperature (only for warm air ventilation systems)

B² with coated fusible link, 72 °C release temperature

WB² with coated fusible link, 95 °C release temperature (only for warm air ventilation systems)

5 Country of destination

Specify country code

6 Nominal size [mm]

100, 125, 150, 160, 180, 200, 224, 250, 280, 315

7 Accessories 1

No entry: without accessories

ER circular installation block

TQ2 square installation kit

WA2 Installation kit for mounting directly on walls and ceilings

WE2 Installation kit for installation away from walls and ceilings

GL2 Installation kit for flexible ceiling joint

TS2³ Rectangular narrow installation kit for dry mortarless installation in solid wood ceilings (twin installation)

8 Accessories 2

No entry: without accessories

Two entries required: accessories for operating side and for installation side

0 Side without accessories

A Cover grille

S flexible connector

9 Attachment

Z00 – ZEX4

¹ not with attachment ZEX1 - ZEX4

² only with attachment Z00 – Z03

³ For installation, a second FKRS-EU of the same nominal size with TS2 is always required

Order example: FKRS-EU-1-7-W/DE/200/TQ2/SA/ZL10

Type	FKRS-EU Fire damper
Casing variant	powder-coated casing, RAL 7001 (silver grey)
Damper blade variant	impregnated damper blade
Fusible link/thermoelectric release device	95 °C release temperature
Country of destination	Germany
Nominal size [mm]	200
Accessories 1	square installation kit
Accessories 2	Operating side: flexible spigot, Installation side: cover grille
Attachment	Spring return actuator 24 V AC/DC and module WA1/B3-AD

Downloads

product information

Product data sheet – FKRS-EU

FKRS-EU_PD_2025_10_28_DE_en Product data sheet 2,1 MB pdf

certificates

ATEX Certificate FKRS-EU

TROX_21TH0381_EPS-21-ATEX-2-142-X_en_0_signed Certificate 820 KB pdf
Certificate concerning statistical leakage tests

LC_v1_2024_10_DE_en Certificate 660 KB pdf
Declaration of hygiene conformity

FKRS-EU_HC_2024_05_DE_en Certificate 1,8 MB pdf
Declaration of performance FKRS-EU

FKRS-EU_DoP_006_2024_07_DE_en Declaration of performance 440 KB pdf
EU Declaration of conformity - ATEX - FKRS-EU

FKRS-EU_CE_ATEX_2022_01_25_DE_en Certificate 1,3 MB pdf
Environmental Product Declaration FKRS-EU

FKRS-EU_EPD_2024_03_DE_en Environmental Product Declarations 410 KB pdf

operation manuals

Additional Manual – Conversion kits

A00000057380/11/2016 Additional Manual 970 KB pdf
Installation and operating manual Fire damper - FKRS-EU

FKRS-EU_IOM_A00000092709_V4_2025_05_GB_en Assembly and operating instructions 14 MB pdf
Installation and operating manual short version – FKRS-EU

FKRS-EU_SV_IOM_A00000092711_V4_2025_05_GB_en Installation and operating manual 3,5 MB pdf
Installation and operating manual Combined penetration seal

11/2019/A00000076896 Installation and operating manual 4,3 MB pdf
Repair instructions FKRS-EU – Blade Replacement

FKRS-EU_OM_A00000082350_V4_2024_06_GB_en Repair instructions 3,6 MB pdf
Supplementary installation manual FKRS-EU – Sandwich panel walls

FKRS-EU_Steinschott_IM_A00000072076_V1_2023_11_GB_en Supplementary installation manual 1,6 MB pdf
Supplementary installation manual kit GL2

FKRS-EU_GL2_IM_A00000041590_V1_2023_04_GB_en Additional installation manual 2,5 MB pdf

MONTAGEVIDEO

EINFACHE MONTAGE: WEICHSCHOTTEINBAU FÜR RUNDE TROX-BRANDSCHUTZKLAPPEN

Während in der Vergangenheit die Öffnungen für den Einbau einer Brandschutzklappe in eine massive Wand oder Decke exakt und nur mit geringen Toleranzen geplant und ausgeführt wurden, können die Weichschott-Lösungen sehr viel flexibler gehandhabt werden. So wird die Montage in vorhandene Öffnungen möglich, die umlaufend um bis zu 400 mm größer sein können als die Gehäuseabmessung. Exakte Planungen der Einbauöffnungen sind damit nicht mehr zwingend erforderlich

MONTAGEVIDEO

FKRS-EU Conversion from fusible link to spring return actuator

FKRS-EU- Handling
and replacing the fusible link holder

FKRS-EU Mounting
limit switch

FKRS-EU- Converting
a BLF actuator to an explosion-proof actuator

FKRS-EU- Converting
a BLF actuator to BFL actuator

References

Hotel Schani

Project: Hotel Schani

Area of Application: Hotels

Location: Vienna, Austria

Project Type: New Building

Completion: 04.2015

Owner: Mag. Benedikt Komarek

Architect: archisphere – gabriel kacerovsky zt gmbh

Planer: BACHER REINHOLD Dipl.-Ing.

Air Volume: 21.000 m³/h

TROX-Products

Air Diffusers: HESCO Lüftungsgitter, LDD
Air-Water-Systems: DID-E
Fire and Smoke protection FK-EU, FKRS-EU

TROX Services

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FKRS-EU

Compact dimensions – ideal for restricted spaces

General information

Technical information

Free cross sections and Zeta values

Downloads

product information

Product data sheet – FKRS-EU

certificates

ATEX Certificate FKRS-EU

Certificate concerning statistical leakage tests

Declaration of hygiene conformity

Declaration of performance FKRS-EU

EU Declaration of conformity - ATEX - FKRS-EU

Environmental Product Declaration FKRS-EU

operation manuals

Additional Manual – Conversion kits

Installation and operating manual Fire damper - FKRS-EU

Installation and operating manual short version – FKRS-EU

Installation and operating manual Combined penetration seal

Repair instructions FKRS-EU – Blade Replacement

Supplementary installation manual FKRS-EU – Sandwich panel walls

Supplementary installation manual kit GL2

MONTAGEVIDEO

EINFACHE MONTAGE: WEICHSCHOTTEINBAU FÜR RUNDE TROX-BRANDSCHUTZKLAPPEN

MONTAGEVIDEO

FKRS-EU Conversion from fusible link to spring return actuator

FKRS-EU- Handling and replacing the fusible link holder

FKRS-EU Mounting limit switch

FKRS-EU- Converting a BLF actuator to an explosion-proof actuator

FKRS-EU- Converting a BLF actuator to BFL actuator

References

Hotel Schani

TROX Services

TECHNICALLY NECESSARY

STATISTICS AND WEBSITE ANALYSIS

CONVENIENCE AND PERSONALISATION

FOR THE BEST TROX EXPERIENCE

FKRS-EU- Handling
and replacing the fusible link holder

FKRS-EU Mounting
limit switch

FKRS-EU- Converting
a BLF actuator to an explosion-proof actuator

FKRS-EU- Converting
a BLF actuator to BFL actuator