It is applied to smoke-emitting system in aisles, fireproof lift lobbies and no window Rooms, insta It is applied to smoke-emitting system in aisles, fireproof lift lobbies and no windowRooms, installed on wall or ceiling as smoke-emitting opening or air inlet.Performance characteristics:1.It's normally close and can make valve open promptly by turning on dc24v power.2.It will close automatically once temperature reaches 280c3.Hand-operated open or return.4.Display valve on signal, can work simultaneously with other fireproof devices.5.Online remote control

Fireproof and Smoke-Emitting Opening