The duct smoke dampers mainly for ventilation and air conditioning systems, usually in a "normally open" state, when the air temperature reaches 70 ℃, by internal fuse action valve automatically closes. Exhaust port, exhaust valve is mainly set in the pipe exhaust system, or installed in the inlet of the exhaust fan fire, usually turned off, in case of fire, through interaction, automatically turn on the exhaust. Some building fire projects in the reuse of these devices circumstances. Such as Chongqing Tobacco Building is an example. Automatic tobacco smoke damper Chongqing mainly office and commercial building fire dampers fvd, long aisle 280 damper, 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 valve 150 ℃ smoke dampers, smoke exhaust fan at the entrance to the fire also designed an electric smoke damper normally closed. Obviously, this design features a waste of existence, but also modules, valves, construction costs of waste. 150 ℃ damper _ _ Plumper ventilation dampers provided by Dezhou Plumper ventilation plant. Dezhou Plumper ventilation plant (0) quality services and products, and are subject to approval and confidence in the new and old customers and the industry. Our company is a certified member of the whole network Commercial Union, Commercial Union customer service icon on the page, you can talk directly with our customer service staff, to our future cooperation happy!