Normal Close Volume Control Damper Fire Smoke Damper For Air Ducting

FHW - 4 HVAC Systems Manual Fire Normal Close Air Smoke Damper

Description : 

1.70 ℃ or 280 ℃ temperature automatic switch
2. Fire Center electronically controlled shutdown
3. Manually shut down
4. Manual Reset
5. When closed, one or two pairs of contacts output signal.

If there is no note, it only output one contact signal.
6. When round duct size ≥630mm, can choose square round

electronically controlled dampers

7.When the five-speed manual adjustment valve open,

control its ventilation.