70 degrees dampers used in air supply, ventilation system pipes; usually always open, closed when the fire interlock fan dampers, the fan turned off; 280 degrees dampers used in the exhaust system pipe, usually always open fire valve Jingjiang, when the fire smoke, when the flue gas temperature reaches 280 degrees damper size, fire dampers close, interlocking fan closed; a positive pressure fan blower = = up fans, and with different names, a variety of uses, transport gas temperature below 80 ℃ exhaust fan for fire smoke, required to run 30min at 280 ℃, can also be used for kitchen hood exhaust fan fire dampers picture, multi-purpose, conveying gas below the temperature of 80 ℃ 2:70 damper and 280 degrees on the relationship between fire damper and the blower exhaust pipe using fire damper 280 degrees, according to the fire district with the rest of the 70-degree high regulation damper say "smoke damper" is different from "damper" caidian damper damper damper _ _ 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!