Products using duplicate use of these devices in some cases fire engineering construction projects. Such as Chongqing Tobacco Building is an example. Automatic tobacco smoke damper Chongqing mainly office and commercial buildings, walkways long mechanical exhaust system is set up, 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 sales damper, this design features a waste of existence, but also modules, valves, construction costs of waste. Our company is a Texas fire products designated manufacturers, specializing in the production of various damper damper installation, smoke damper, exhaust valves, fire fans and other products, all through the National Fire Testing Center, FH-FVD2 damper features: usually normally open damper, fuse operating temperature 70 ℃. When the temperature of the air inside the duct reaches 70 ℃, fusible film fuse, the valve automatically closes under the force of the torsion spring. When the valve is closed, the output signal is turned off. Manually close the damper specifications, manual reset open. PY-SD PY-BSD exhaust valve exhaust valve remote control features: DC24V electrical signal can quickly open the valve. Manually open. Output Enable signal, interlocking exhaust fan. Manual reset closed. PY-BSD exhaust valve can be opened manually remote control, remote control manual reset closed. Product Principle installed central air-conditioning duct system works extremely fluxing temperature control, by the action of gravity and spring mechanism closes the valve. When a fire occurs, the flame duct invasion, high temperature melting fusible alloy valves, or to make memory alloy deformed the valve automatically closes for the duct and the fire district throughout occasions stainless steel damper damper _ _ Swiss Heze Xin Cheng Rui Xincheng air conditioning provided by the Texas Air Conditioning Equipment Co., Ltd .. Texas Rui Xincheng Air Conditioning Equipment Co., Ltd. (www.dzrxckt.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 Rui Xincheng air conditioning and you hand into the brilliant, for a better future!