Exhaust system used for the basement, large shopping malls, large fire district, long corridors dtf exhaust fan, and under natural draft does not meet their needs, circumstances plus mechanical exhaust system. Opening plus exhaust valve exhaust port form, plate electric exhaust port forms can also be normally closed. Fans can be used in conjunction with underground diversion. Basement, to be used in conjunction with the makeup air equipment. Fire exhaust fan set Location: Distance tunnel fire exhaust fan should not be too close to the side wall of the two-speed exhaust fan, so as not to affect the ventilation exhaust fan fire arranged a minimum distance from the tunnel wall is 20 cm, rescue "sentinel" of. Set the tunnel disaster prevention into 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 htf fire exhaust fan, ventilation must be maintained at a positive cross-channel port pressure state, to prevent flue gas flow channel. ventilation system blowing from the direction of the incident 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 cross-channel and security the tunnel, waiting area while ensuring the required fresh air tunnel according to different regions use different incidents of disaster prevention and Ventilation. "sentinel" Disaster ventilation scheme implemented when the train rescue point in the "sentinel" range for all Cross liaison channel settings can be reversed within a secure tunnel fan made from fresh wind. fire temperature exhaust fan, air conditioning Chenyu quality (certified), Beichen District exhaust fan by wucheng Chenyu Air Conditioning Equipment Co., Ltd. available. 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.