1.ISO9001/ISO14001 2.air damper fire damper,air damper,volume control damperThe functions of fireproof valves NameModelFunction ... put opening signal≥250*250rectanglePYK-5IISFDlong distanced leafy discharge smoke vent PYK-3 IBSDDC24V turned on,manual open, ... reset,out put opening signal≥320*320rectangle≤800*800discharge smoke windowPYCBSDControl center outputs DC24V electrical signal opening,long ...