Choice points: exhaust fans choose the main control parameters for temperature, air flow, total pressure, efficiency, noise, electrical power, speed and shaft power. Exhaust fan at medium temperature not higher than 85 ℃ conditions should be long-term normal operation. Exhaust fan shall ensure that: When the transmission medium temperature at 280 ℃ during continuous work 30min htfc exhaust fan, and at medium temperature cooled to ambient temperature still continuous running. At rated speed in the work area, fans of the measured pressure curve and the instructions given in the curve should satisfy the following requirements: axial-flow exhaust fan in the prescribed exhaust fan, which corresponds to the pressure deviation of ± 5%. Centrifugal exhaust fan at the specified temperature exhaust fan flow model, the corresponding pressure deviation ± 5%. Fire exhaust fan set Location: Distance tunnel fire exhaust fan should not be too close to the side wall, so as not to affect the ventilation exhaust fan fire tunnel wall arranged for a minimum distance from 20 cm, rescue "sentinel" setting will tunnel into. Disaster different regions, make full use of deviated and both ends of the tunnel exhaust fan fire rescue station designated as the wind and smoke into the new channel, cross ventilation openings must maintain positive pressure state hotel with exhaust fan to prevent smoke airflow ventilation system to supply air to the incident direction of the channel tunnel from a secure tunnel to cross the channel by inhibiting the flue gas into a cross-channel and tunnel accident did not occur to meet the evacuees facing fresh air into the tunnel cross passages and safety, while ensuring that When the waiting area needed fresh air. According to different regions within the tunnel accident Disaster different ventilation mode. "sentinel" Disaster ventilation scheme implemented when the train rescue point in the "sentinel" range for all of the cross-channel contact settings can be reversed within a secure tunnel fan made from fresh air. Hotel Direct (certified) with exhaust fan air conditioning manufacturers _ _ Chen Yu Lin, exhaust fan provided by Wu Cheng Chen Yu Air Conditioning Equipment Co.. 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.