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 electric damper 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 opening dampers in place 70 degrees price, three off place) feedback signals are normally open dry contact signal. This automatic smoke dampers designed by Jingjiang City Star conditioning plant machinery and equipment, manufacture and use has been put into normal operation. Instructions for use; dampers installed in the entrance of the exhaust fan and ventilation and air conditioning systems use either system, usually in a "normally open" state, ventilation, air flow in the pipe when the temperature reaches 280 ℃ when the automatic smoke dampers, valves rely on easy temperature of the molten metal fuse action and automatically shut down, cutting off airflow to prevent the spread of fire. There are some buildings in fire protection engineering projects to reuse these devices circumstances. Such as Chongqing Tobacco Building is an example. Automatic tobacco smoke damper Chongqing mainly office and commercial building fire dampers, long corridors, set up a mechanical exhaust system, each floor is only a smoke partition. Smoke on each floor electric charge of the design of a normally closed damper, each of each exhaust port has designed an electric normally closed exhaust valves, exhaust fan inlet of the fire has designed a normally closed electric smoke damper. Obviously, this design features a waste of existence, but also modules, valves, construction costs of waste. 70 degrees damper Price | Chen Yu-conditioned factory outlets (certified) | damper Shijiazhuang City by Wu Chen-yu air-conditioning Limited. Wu Cheng Chen Yu Air Conditioning Equipment Co., Ltd. (www.wccykt.com) is a leader in Dezhou, fans, ventilation equipment, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs . Chen Yu-conditioning in leadership with the staff warmly welcome all inquiries negotiations to create Chenyu conditioning a better future.