Exhaust fans are smoke control system in the fire protection system, which is generally linked with the fire alarm host. Smoke damper settings roof exhaust fan exhaust fan in connection with the exhaust pipe, the exhaust pipe is not set end exhaust valves, exhaust valves and the exhaust note damper is completely different device functions. Exhaust valve usually normally closed, opened fire, and alarm host linkage, automatic alarm system is turned on condition that a fire broke out (detector alarm), fire alarm host into automatic mode, exhaust valves open automatically, 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 set Location: Distance tunnel fire exhaust fan should not be too close to the side wall exhaust fan fire htf avoid affecting ventilation exhaust fan fire tunnel wall arranged for a minimum distance from 20 cm, rescue "sentinel" of. Set the tunnel disaster prevention into different regions, make full use of fire exhaust fan deviated and fixed at both ends of the tunnel as a rescue station into fresh air and exhaust channels, cross ventilation openings must maintain positive pressure state exhaust fan models, to prevent the flow of flue gas channel. ventilation system blowing from the direction of the accident tunnel through a secure tunnel to cross the channel, inhibiting the flue gas into a cross-channel and tunnel accident did not occur to meet the evacuees facing the new air into the tunnel cross passages and safety inside, waiting area while ensuring the required fresh air in the tunnel area according to different accident Disaster different ventilation mode. When the "sentinel" Disaster ventilation scheme implemented when the train designated rescue, all in "sentinel" range Contact cross channel settings can reverse the fan made from fresh wind tunnel safety. htf exhaust fan fire, Chen Yu-conditioned factory outlets (certified), Chengde exhaust fan provided by Wu Cheng Chen Yu Air Conditioning Equipment Co., Ltd .. Wu Cheng Chen Yu Air Conditioning Equipment Co., Ltd. (www.wccykt.com) is a leader in Dezhou, fans, ventilation equipment, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs . Chen Yu-conditioning in leadership with the staff warmly welcome all inquiries negotiations to create Chenyu conditioning a better future.