Circular fire dampers with a fire resistance of 120 minutes. When the temperature in the damper rises above 72 °C the fusible link will break and the damper will close. When closed, the expanding material around the fireblade will swell and assure a fire and air-tight seal against hot air and smoke. The tunnel is made out of galvanized steel. The CR120 + MFUS fire dampers have a manual operating mechanism with indication of the blade position

Ød (mm) = 125

Galvanized steel tunnel with rubber duct sealing

Fibersilicate fireproof blade

Intumescent strip

Manual control mechanism MFUS with fusible link 72 °C

CONSTRUCTION

1. Refractory casing made of galvanised steel

2. Damper blade 20 mm

3. Operating mechanism

4. Rubber sealing ring

5. Intumescent strip

6. Mounting plate for thermo-electrical fuse (not used on manually controlled dampers)

7. Positioning plate ¾ 8. Sealing ring damper blade