Description：
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.

Features:
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.