A sound level than the exhaust fan noise limits in the description given operating point should be consistent with the provisions under the JB / T8690-1998 of. Exhaust fan can be an ordinary or special steel centrifugal exhaust fan axial fan. Exhaust fan specifications according to "fire protection design of tall buildings" in the regulations. The minimum air volume exhaust fan 7200m / h htf fire exhaust fan, should not exceed the maximum amount of wind 60000m / h (refer to a smoke partition maximum amount of wind). Exhaust fan air flow should be required to increase airflow value of not less than 10% to 20% of the surplus amount. Pressurized smoke exhaust fan pressure value shall be calculated loop system is the most unfavorable, and to ensure that the value of the residual pressure in the stairwell 40 ~ 50Pa. The value of the residual pressure inside the front room, shared room, fire elevator room, refuge layer 25 ~ 30Pa. Fire exhaust fan should be consistent with the current standard JB / T10281-2001 "fire exhaust fan technical conditions." Fan exhaust system should be set individually. Exhaust fan should be in the same position or upper layer of smoke zone. 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 20 cm distance from the roof exhaust fan, rescue "sentinel" setting. The tunnel is divided into different regions of disaster prevention, and make full use of inclined 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 exhaust fan model prevent flue gas flow channel. ventilation system to air, flue gas into a cross-channel and suppress tunnel accident did not occur to meet a cross from the secure tunnel through the channel tunnel to the accident evacuation direction facing the new air into the tunnel cross passages and safety while ensuring the required waiting area with fresh air. According to different regions within the tunnel accident Disaster different ventilation mode. When the "sentinel" Disaster ventilation scheme implemented when the train rescue point in the "sentinel" range for all contacts Cross channel settings can reverse the fan made from fresh wind tunnel safety. exhaust fan model, Chen Yu-conditioned factory outlets (certified), Zhucheng City exhaust fan provided by Wu 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.