Model HTF-Ⅰ, HTF-Ⅱ, said pressure type fire temperature exhaust fan, leaf type with axial flow: HTF-Ⅰ (single speed) and HTF-Ⅱ (double speed) of two; HTF-Ⅲ, HTF -Ⅳ representation pressure fire temperature exhaust professionals; HTF-X for silencer type fire temperature exhaust fan, the user can choose according to the actual needs of different kinds; HTF-W Series rooftop fire temperature exhaust fan exhaust fan quote The user can choose according to the actual needs of flame-retardant fiberglass hood or steel hood; HTF-D for low pressure type fire temperature exhaust fan; Special Note: GYF and HTF series fan is a similar product works exhaust fan in the fire system belong smoke control system, which is generally linked with the fire alarm host. Setting smoke damper in the exhaust fan and exhaust pipe connections, the exhaust pipe is not the end to set two-speed exhaust fan exhaust valves, exhaust valves and smoke damper attention is entirely different device functions. Exhaust valve usually normally closed, opened fire, and explosion-proof alarm host linkage exhaust fan, open the condition that the fire alarm system occurs (detector alarm), fire alarm host into automatic mode, exhaust valves automatically open exhaust fan linkage exhaust fan starts. Smoke damper is usually always open, but also turned a fire, but when the flue gas temperature reaches 280 ℃, the smoke damper automatically close linkage has been opened fan stops running. Fire exhaust fan, air conditioning Rui Xincheng (certified), exhaust fan provided by Rui Xincheng Air Conditioning Equipment Co., Texas. Texas Rui Xincheng Air Conditioning Equipment Co., Ltd. (www.dzrxckt.com) is a leader in Dezhou, fans, ventilation equipment, over the years, the company implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs . Rui Xincheng conditioning in leadership with the staff warmly welcome all inquiries negotiations to create a better future Rui Xincheng air conditioning.