Product Principle; installed in the central air-conditioning duct system works extremely fusing temperature control payments using the force of gravity acting and spring mechanism closes the valve. When a fire occurs, the flame duct invasion, high temperature melting fusible alloy 280 smoke damper valves or make memory alloy deformed the valve automatically closes the damper for duct and fire district throughout the occasion. Product standards; GB15930-1995 "damper test method" Product Category; dampers installed in the ventilation, air conditioning system, the return air duct on the road, usually was turned on automatic smoke dampers, gas pipes when the temperature reached inside when the fire 70 ℃, fusible film fuse, the valve automatically closes in the torsion force, within a certain period of time to meet the fire resistance stability and fire integrity requirements, from the effects of smoke fire retardant across the valve. When the valve is closed, the output signal is turned off. Fire and smoke control valve, normally open, 70 degrees is closed, with a, but more of a telecommunications signal input, remote control can eliminate the control room is closed, generally used for peacetime air, fire, wind up sharing a duct system, you can control fire Turn off unneeded air make room; smoke damper damper _ _ Zhengzhou Chenyu air conditioning services provided by Wu Cheng Chen-yu air-conditioning Limited. Wu Cheng Chen Yu Air Conditioning Equipment Co., Ltd. (www.wccykt.com) strong, credible, in Dezhou fan, ventilation equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Chenyu air conditioning and you hand into the brilliant, for a better future!