Usually 280 degrees blows smoke damper should be normally closed or normally open? This is based on the actual design to like, fire dampers installation, are now linked, fire dampers, normally closed by a fire alarm linkage, open exhaust fan automatically open exhaust valve. There are generally two dampers one is 70 degrees and 280 degrees! 280 degrees smoke damper in the exhaust system in general, under normal circumstances is normally closed when the fan starts to open, fire dampers use, the temperature exceeds 280 degrees closed. Smoke damper, fire control valve, 70-degree fire dampers, exhaust valves, dampers works, fire dampers picture, fire dampers installation location, wiring diagram 280 degrees fire dampers, exhaust fans, diffusers, dampers, positive pressure blower, air flow control valve, damper prices, flue damper smoke fire damper how many products? Smoke damper divided into several product? Damper and smoke damper differences? Fire and Smoke Products Classification - Class 1 exhaust, smoke exhaust The exhaust port: electric, manual or remote open, and exhaust fan interaction, 2800C closing means may be provided for a ceiling or wall exhaust area 2, the exhaust valve Exhaust valve: electric or manual opening, and exhaust fan linkage opening for the exhaust duct system 3, smoke damper Smoke damper: electric or manual opening, 2800C fuse closed for smoke suction fan at the entrance duct 4, smoke window The smoke exhausting window: rely smoke control action, electric open, can also be remotely turned on facades for natural smoke at smoke damper, fire control valve, 70 degrees damper, exhaust valves, dampers works, fire dampers picture, fire dampers installation location, wiring diagram 280 degrees fire dampers, exhaust fans, diffusers, air valve, positive pressure blower, air flow control valve, fire valve price, the flue damper, Texas Air Conditioning Equipment Co., Ltd. Hao Yang fire dampers installation, Hao Yang air conditioning equipment (certified), the damper from the Texas Air Conditioning Equipment Co., Ltd. Hao Yang. Hao Yang Texas Air Conditioning Equipment Co. (www.dzapjt.com) is an industry leader in Shandong Dezhou, fans, ventilation equipment, over the years, the company implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Hao Yang air conditioning equipment in leadership with the staff warmly welcome all inquiries negotiations to create Hao Yang air conditioning equipment better future.