1. smoke damper normally closed (NC, telecommunications No. open, closed electric fuse damper 280 degrees, or manually shut down) generally used in exhaust systems, exhaust fan can be installed at the inlet of a fire at the Consumers control room control is on, when you close the chain also closes the exhaust fan. Exhaust valves, with the three, each unit different names, some based on its operating temperature is called the exhaust valves, and some based on its use of nature called damper, but just an ordinary damper device side fuse metal exchange 280 degrees blown into that kind of .3 automatic smoke damper (Metro Engineering) fire subway ventilation and air conditioning systems, exhaust valves have automatic fire alarm equipment and gas extinguishing system linkage control functions. Each automatic smoke dampers have two independent electric control signal, respectively, by EMCS, gas consumption system to monitor, control signals are DC24V ± 10% signal. Each automatic smoke dampers have six independent feedback signal (three open place, three off place) feedback signals are normally open dry contact signal. 1. The damper is suitable for pipe ventilation, air conditioning or exhaust system, the basic functions and applications are shown in Table 1.2. Selection valve should pay attention to the function of the valve, normally open or normally closed, shut down automatically open, manually close open , manual reset, signal output, remote control and other requirements. 3. If the valve and fan interaction should be used with double micro-switch device. 5. The body should be steel damper blade thickness of 2 ~ 6mm, the body of non-combustible material, rotating parts should be corrosion-resistant metallic materials, and flexible rotation. Shall not be less than the thickness of the valve housing 2mm. Yi Rong parts shall comply with recognized standards of the fire department. 280 degrees damper, Handan fire dampers, air conditioning service provided by Chen Yu Chen Yu Wu City Air Conditioning Equipment Co., Ltd. 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!