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 exhaust fan model and medium temperature cooled to ambient temperature still continuous running. At rated speed roof exhaust fan 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 at a predetermined flow rate, corresponding to the pressure value deviation of ± 5%. Centrifugal exhaust fan at a predetermined flow rate, the pressure corresponding to the deviation of ± 5%. 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, the maximum air flow should not exceed 60000m / h (refers to a smoke partition of maximum air volume). 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. Exhaust air conditioning duct _ Chenyu quality assurance (certified) _ 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.