It is fixed in the ventiduct of the aircondition system and the place where has the requirement of ventilation. Keep opening,
automatic or manual close, manual reposition and open.
Smoke sensor, close the valve manually
when it reachs 70℃ or 280℃,fusing chip is working ,and the vavel closes automatically.
Jiggle switch input close signal and linkage line, and control the ventilation by control center, air-conditioner stops working.
The vane of valve is between 0°-90°, the volume can be adjusted in 6 levels.