Fire dampers, normally open, 70 degrees close 2015 new exhaust damper, generally installed in the duct through the firewall, fires off effect, you can set the output electrical signal, the temperature exceeded 70 degrees automatic smoke damper valve closed smoke damper, linkage to send (s) off the fans; installed in the ventilation, air conditioning system, the return air duct on the road, usually was turned on, the gas pipeline fires when the temperature reaches 70 ℃, smoke damper suppliers, fusible fuse, the valve automatically closes factory smoke damper level under torsion force, within a certain period of time to meet the fire resistance stability and fire integrity requirements, from smoke fire retardant valves. When the valve is closed, the output off signal. Lingwu smoke damper, smoke damper Warlords manufacturers, Yanda air conditioning (certified merchants) by Wu County Yanda air-conditioning plant. Wu County Yanda air-conditioning plant (www.wcydkt.com) (www.wcydkt.com) is specialized in "galvanized duct, exhaust fan, fire dampers, check valves, air, regulating valve, muffler equipment ", the company adhering to the" honesty, hard service "concept, to provide you with the highest quality products and services. Welcome to inquire! Contact: Wu Yusong.