Tip: One method is to exhaust port of the exhaust valve and the module cancel hoods wind valve outlet into a single louvers; second method is to put a normally closed damper on each electric charge of the smoke was changed normally open 280 degrees off the wind damper valve, the control module replaced by a general monitoring module. Both methods achieve the same fire code requirements vent valve model, and the actual control is also very reliable. 70 degrees dampers used in air supply, ventilation system pipes; usually always open, closed when the fire interlock fan vent valve company, the fan turned off; 280 degrees dampers used in the exhaust system pipe, usually always open When fire smoke, when the flue gas temperature reaches 280 degrees, the damper is closed, the fan interlock closed; vent valve models | Sichuan wind valve | Wuhan Han Wei Wei Li Yuen Yuen provided by the Wuhan-being of Equipment Co., Ltd. Wuhan Han Wei Li Yuen-being of Equipment Co., Ltd. (www.whhwly.com) strong, credible, in Wuhan, Hubei fan, ventilation equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Wuhan Han Wei Li Yuen and you hand into the brilliant, for a better future!