Four-sided dampers
There are no products matching the selection.
FK2-EU

Four-sided fire damper for closing duct passages between fire compartments, for different installation types, available in many sizes and designs. The FK2-EU fire dampers are available in sizes: 200×100 - 1 500×800 mm, in 1 mm increments. Low pressure drop and sound power level with versatile installation options. Integration into the central building management system using TROXNETCOM. Fire resistance class up to EI 120 (ve, ho, i ↔ o) S. The FK2-EU fire dampers in the ATEX version can be available on request.
This damper replaces the previous types of fire dampers FKA-EU and FKS-EU. The new damper model brings many innovations over previous models.
FK2-EU fire damper options and accessories: Electric servo-drive 24V / 230V. Starting temperature 72/95 °C or smoke detectors.
The fire damper in accordance with European standard EN 15650 in square or four-sided design, with two large inspection openings that can be opened without tools. Tested for fire performance according to EN 1366-2 (suction 300 Pa and 500 Pa), with CE marking.
Product data sheet: FK2-EU.pdf. Product series declaration: FK2-EU-declaration-of-performance.pdf. Instruction manual for series: fk2-eu-manual.pdf. ATEX-certificate: ATEX-EU-declaration-Type-FK2-EU.pdf
- Made-to-measure dimensions for 1 mm
- Two inspection openings
- Damper height from 100 mm
- Possibility of retrofitting the servo-drive
- Reduction of pressure drop by 24% due to larger free cross section
- Suitable for a wide range of installation situations (certified)
- Hygienic certificate
FDMB

The FDMB fire dampers are closures in HVAC systems that prevent the spread of fire and combustion products from one fire compartment to another. The damper blade automatically closes the air duct by means of a spring or a servo drive. The closing spring is actuated by pressing the start button or by a pulse from the thermal fuse. The return spring of the servo drive is activated when the BAT thermoelectric starter is activated. After closing the blade, the damper is sealed against the passage of smoke with a silicone seal. At the same time, the damper blade is embedded in a mass, which increases its volume due to the increasing temperature and closes the air duct airtight.
Characteristics of dampers
- CE certification according to EN 15650
- Tested according to EN 1366-2
- Classified according to EN 13501-3+A1
- Fire resistance EIS 120, EIS 90
- Tightness according to EN 1751, class C through the damper body and class 2 through the damper blade
- Cycling test in class C 10 000 according to EN 15650
- Corrosion resistance according to EN 15650
- EC Certificate of Conformity No. 1391-CPR-0011/2014
- Declaration of performance No. PM/FDMB/01/20/1
- Hygienic assessment - Report No. 1.6/pos/19/19b
Operating conditions
Faultless operation of the dampers is ensured under the following conditions:
a) maximum air flow speed of 12 m/s
maximum pressure difference of 1200 Pa
b) even distribution of the air flow in the entire cross-section of the damper.
The operation of the dampers does not depend on the direction of air flow. The dampers can be mounted in any position.
The dampers are designed for air mass without abrasive, chemical and adhesive impurities.
Catalog sheet of the production line FDMB
Certificate of constancy of parameters FDMB
The FDMB fire dampers replace the PKTM-III dampers.
FDMA

The FDMA fire dampers are closures in HVAC systems that prevent the spread of fire and combustion products from one fire compartment to another. The damper blade automatically closes the air duct by means of a spring or a servo drive. The closing spring is actuated by releasing the trigger lever. The impulse to release the trigger lever can be manual, thermal or by means of an electromagnet. The return spring of the servo drive is activated when the BAT thermoelectric starter is activated. After closing the blade, the damper is sealed against the passage of smoke with a silicone seal. At the same time, the damper blade is embedded in a mass, which increases its volume due to the increasing temperature and closes the air duct airtight.
Characteristics of dampers:
- CE certification according to EN 15650
- tested according to EN 1366-2
- classified according to EN 13501-3+A1
- fire resistance EIS 120, EIS 90
- tightness according to EN 1751, class C through the damper body and class 2 through the damper blade
- cycling test in class C 10 000 according to EN 15650
- corrosion resistance according to EN 15650
- EC Certificate of Conformity No. 1391-CPR-2016/0158
- Declaration of performance No. PM/FDMA/01/20/1
- Hygienic assessment - Report No. 1.6/pos/19/19b
Operating conditions:
Faultless operation of the dampers is ensured under the following conditions:
a) maximum air flow speed of 12 m/s
maximum pressure difference of 1200 Pa
b) even distribution of the air flow in the entire cross-section of the damper.
The operation of the dampers does not depend on the direction of air flow. The dampers can be mounted in any position.
The dampers are designed for air mass without abrasive, chemical and adhesive additives.
Catalog sheet of the production line FDMA
Certificate of constancy of parameters FDMA
The FDMA fire dampers replace the PKTM 90 dampers.
FDMQ

The FDMQ fire dampers are closures in HVAC systems that prevent the spread of fire and combustion products from one fire compartment to another. The damper blade automatically closes the air duct by means of a spring or a servo drive. The closing spring is actuated by pressing the start button or by a pulse from the thermal fuse. The return spring of the servo drive is activated when the BAT thermoelectric starter is activated. After closing the blade, the damper is sealed against the passage of smoke with a silicone seal. At the same time, the damper blade is embedded in a mass, which increases its volume due to the increasing temperature and closes the air duct airtight.
Characteristics of dampers
- CE certification according to EN 15650
- Tested according to EN 1366-2
- Classified according to EN 13501-3+A1
- Fire resistance EIS 120, EIS 90
- Tightness according to EN 1751, class C through the damper body and class 2 through the damper blade
- Cycling test in class C 10 000 according to EN 15650
- Corrosion resistance according to EN 15650
- EC Certificate of Conformity No. 1391-CPR-2020/0003
- Declaration of performance No. PM/FDMQ/01/20/1
- Hygienic assessment - Report No. 1.6/pos/19/19b
Operating conditions
Faultless operation of the dampers is ensured under the following conditions:
a) maximum air flow speed of 12 m/s, maximum pressure difference of 1200 Pa
b) even distribution of the air flow in the entire cross-section of the damper.
The operation of the dampers does not depend on the direction of air flow. The dampers can be mounted in any position.
The dampers are designed for air mass without abrasive, chemical and adhesive impurities.
Catalog sheet of the production line FDMQ
Certificate of constancy of performance FDMQ
The FDMQ fire dampers replace the PKTM 90-PM (four-sided dampers).
FDS

The FDS rectangular fire damper is designed to divide fire compartments and prevent the spread of toxic gases, smoke and flames. The FDS fire damper is an element of passive fire protection and, together with the method of its installation, is an inseparable part of the evaluation of the fire resistance of a building. The FDS rectangular fire damper is certified according to the ČSN EN 15 560 standard, tested according to ČSN EN 1366-2 and classified for EIS according to the 13501-3+A1 standard. The FDS fire dampers are made of galvanized sheet steel and contain lime-silica parts, fire-resistant carbon fiberglass, polyurethane foam and ethylene-propylene rubber.
Types of offered FDS fire dampers
FDS-3G
Damper with fire resistance up to 120 minutes, the casing is made of one piece. Size range from 100x100 to 1200x800 mm.
FDS-3G-KS
Damper with fire resistance up to 120 minutes equipped with a square installation kit designed for a square installation opening, which is a fixed part of the damper. Size range from 100 to 630 mm.
FDS-3G-OF
Damper with fire resistance up to 120 minutes equipped with protection overflow grille on both sides. Size range from 200x200 to 1200x800 mm.
FDS-EI90S
Damper with fire resistance up to 90 minutes, the casing is composed of two steel parts, conductively connected via a calcium-silicate central frame. Size range wider than 1200 mm and higher than 800 mm, maximum 1600x1000 mm.
FDS-EI120S
Damper with fire resistance up to 120 minutes, the casing consists of two steel parts, conductively connected via a calcium-silicate center frame. Size range wider than 1200 mm and higher than 800 mm, maximum 1600x1000 mm.
The FDS fire dampers are supplied with manual control or with an actuator.
FDS fire damper with manual control
The FDS fire damper mechanism is activated when the temperature at the fuse reaches 74 °C (100 °C on request). In the event of a fire, the damper closes automatically within 10 seconds after the thermal fuse has blown. When the grille is closed, the grille blades remain locked in the closed position and can only be opened manually.
FDS fire damper with actuator
The FDS fire damper with actuator is equipped with limit switches as standard, optionally with power supply and communication unit. The actuator closes the damper based on a signal from the building management system (power failure) or when the thermoelectric temperature sensor temperature exceeds 72 °C. The actuator supply circuit is interrupted and the spring closes the damper blades within 20 seconds.
Damper activation mechanism with manual control
• H0
Basic damper design, manual actuation mechanism with return spring and fusible thermal fuse with activation at 74 °C (100 °C on request). The mechanism is equipped with a protection cover IP 44
• H2
Manual activation mechanism H0 + indication of open and closed position by two limit switches for 230V AC or 24V AC/DC. The mechanism is equipped with a protective cover IP 44.
• H5-2
Manual activation mechanism H0 + activation mechanism with 24V AC/DC electromagnet in pulse connection (activation of damper blade closing occurs by impulse after voltage is applied to the electromagnet) + indication of closed and open position of the damper with two limit switches for 230V AC or 24V AC/DC. The mechanism is equipped with an IP 44 protection cover.
• H6-2
Manual activation mechanism H0 + activation mechanism with 230V AC electromagnet in pulse connection (activation of damper blade closing occurs by impulse after voltage is applied to the electromagnet) + indication of closed and open damper position by two limit switches for 230V AC or 24V AC/DC. The mechanism is equipped with an IP 44 protection cover.
Activation mechanism of the dampers controlled by an actuator
• B230T or G230T
Activation mechanism with Belimo (B230T) or Gruner actuator (G 230T) with return spring, further equipped with thermoelectric trigger sensor with activation at 72 °C. The actuator includes two limit switches for signaling the position of the damper blade. Power supply 230V AC.
• B24T or G24T
Activation mechanism with Belimo (B24T) or Gruner actuator (G24T) with return spring, further equipped with a thermoelectric trigger sensor with activation at 72 °C. The actuator includes two limit switches for signaling the position of the damper blade. Power supply 24V AC/DC.
• BST0 or GST0
Activation mechanism with Belimo actuator (BST0, 24V AC/DC, power supply via 230V AC communication unit) or Gruner actuator (GST0, 24V AC/DC, power supply via 24V AC communication unit) with return spring, further equipped with thermoelectric trigger sensor with activation at 72 °C. The actuator includes two limit switches for signaling the position of the damper blade. Power and communication units Belimo BKN 230-24 or Gruner fs-UFC230-2.
• B24T-W or G24T-W
Activation mechanism with Belimo (B24T-W) or Gruner actuator (G24T-W) with return spring, further equipped with thermoelectric trigger sensor with activation at 72 °C and cables for power supply and communication unit (communication unit is not part of the mechanism). The actuator includes two limit switches for signaling the position of the damper blade. Power supply 24V AC/DC.
• B24T-SR or G24T-SR
Activation mechanism with Belimo (B24T-SR) or Gruner actuator (G24T-SR) with return spring and 0-10V control (possibility to set the position of the blade in any position), further equipped with a thermoelectric trigger sensor with activation at 72 °C. The actuator also includes limit switches for signaling of the damper blade position. Power supply 24V AC/DC. This activation mechanism can only be used for dampers with a height H ≥ 160 mm. This version cannot be used for the FDS-EI90S / EI120S dampers.
Catalog sheet of the product line: FDS-en.pdf. Declaration of performance of the product line: FDS_declaration-of-performance.pdf.
FDS-Ex

The FDS-Ex square fire damper is designed to divide fire compartments and prevent the spread of toxic gases, smoke and flames. The FDS-Ex fire damper is an element of passive fire protection and is, together with the method of its installation, an integral part of the assessment of the fire resistance of the building. The FDS-Ex square fire damper is certified according to ČSN EN 15 560, tested according to ČSN EN 1366-2 and classified for EIS according to 13501-3+A1. The ATEX version is manufactured in accordance with Directive 2014/34/Eu for use in hazardous areas. The FDS-Ex fire dampers are made of galvanized steel sheet and contain lime-silica parts, fire-resistant carbon fiberglass, polyurethane foam and ethylene-propylene rubber.
The FDS-Ex fire dampers are available with manual operation or with actuator, in a range of sizes from 100x100 to 1600x1000 mm.
FDS-Ex fire dampers with manual operation
The actuation mechanism of the FDS-Ex fire damper is activated when the temperature at the fuse point reaches 74 °C (100 °C on request). In the event of a fire, the damper closes automatically within 10 seconds after the thermal fuse has melted. Once the damper is closed, the damper blades remain locked in the closed position and can only be opened manually.
FDS-Ex servo-drive actuated fire dampers
The FDS-Ex servo-drive actuated fire damper is equipped with limit switches as standard. The actuator closes the damper on a signal from the building management system (power interruption) or when the thermoelectric temperature sensor exceeds 72 °C. The actuator power circuit is interrupted and the spring closes the damper blades within 20 seconds.
- CE certified to EN 15 560
- Tested according to EN 1366-2
- Classification according to EN 13501-3+A1
- ATEX for gaseous and dusty environments
- II 2D Ex h IIIB T85°C...T100°C Db
- II 2G Ex h IIB T6...T5 Gb
- Manual activation mechanism with IP 44 protection
- Built-in inspection opening
Manual damper activation mechanism
-
H0-Ex - zone: 1.2 (Gb) 21.22 (Db)
Basic damper design, manual activation mechanism with return spring and thermal fuse with activation at 74° C (100° C on request). The mechanism is provided with an IP 44 protective cover. -
H2-Ex - zone: 1,2 (Gb, temperature limit T6) 21,22 (Db, temperature limit T85°C)
Manual activation mechanism H0 + indication of open and closed position by two limit switches at 230V AC or 24V AC/DC. The limit switches are in ATEX version. The mechanism is provided with an IP 44 protective cover.
Servo-drive damper activation mechanism
-
SET-EX - zone: 1,2 (Gb) 21,22 (Db)
Actuation mechanism with Schischek ExMax actuator with return spring, also equipped with thermoelectric actuation sensor with activation at 72°C. The actuator includes two limit switches to signal the position of the damper blade. Power supply 24...240 V AC/DC. -
SRT-EX - zone: only 2 (Gc); only 22 (Dc)
Actuation mechanism with Schischek RedMax actuator with return spring, also equipped with thermoelectric actuation sensor with activation at 72°C. The actuator includes two limit switches to signal the position of the damper blade. Power supply 24...240 V AC/DC.
Product Line Data Sheet: FDS-Ex-en.pdf
Product Line Declaration of Performance: FDS-Ex-declaration-of-performance.pdf
ATEX Certificate: FDS-Ex-ATEX-certificate.pdf