Description：
used on the wall of the building, atria, smoke system of the room without window, or intalled on the wall or ceiling as the air outlet of the smoke venting.

Functions:
close usually, buu when smoke sensor indicates the firealarm,  the contral center automatically put through DC 24V to turn on the valve.
Valve will turn off again when the temperature reaches 280℃.
Manual restoration.
After the valve is open, can turn off the valve by DC 24 V.
can interlock with fireproofing or other setting, output lock and unlock signal.