Motorized circular fire dampers with a fire resistance of 120 Minutes. When the temperature of the thermo-electric fuse in the damper rises above 72 °C the damper will close. When closed, the expanding material around the fireblade will assure a fire and air-tight seal against hot air and smoke. The tunnel is made out of galvanized steel

Ød (mm) = 355

Galvanized steel tunnel 

Fireproof blade in fibersilicate 

Intumescent strip around the valve

230V Actuator BELIMO BFLT230 (small valves) of BFNT230 (other sizes)

CONSTRUCTION

1. Refractory casing 

2. Damper blade 

3. Operating mechanism with: 

-manual rearmation option 

-blade position indicator

4. Sealing cold smoke

5. Blade bumper 

6. Intumescent strip 

7. Thermo-electric fuse 

8. Rubber sealing ring