Exhaust fan in the specification; A sound level noise limits should be consistent with the provisions of JB / T8690-1998 of. Exhaust fan can be an ordinary or special steel centrifugal fan axial exhaust 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 partition of the maximum exhaust air volume). Exhaust fan 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 the most unfavorable loop system to calculate and ensure the value of residual pressure in the stairwell 40 ~ 50Pa. The residual pressure value inside the front room, shared room, fire elevator room, refuge floors, etc. 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 separately. Exhaust fan should be in the same position or an upper layer of smoke region. How it works: the usual two-speed high-temperature exhaust fan at low speed in order to meet the exhaust air flow, when a fire occurs, the temperature exhaust fan in the cabinet under the joint control of the role of automatic high speed htf exhaust fan, to meet needs kitchen exhaust smoke pipeline fan, while fire smoke partition exhaust pipe smoke damper and smoke damper makeup air duct smoke and make no operation of wind exhaust fan, automatic smoke damper other smoke partition HTF series of high-temperature exhaust fan fire Overview: HTF series fire temperature exhaust fan with excellent performance, high temperature performance, high efficiency, covering less than the centrifugal fan, easy installation. HTF series fire temperature exhaust fan of "national fixed fire extinguishing systems and fire-resistant component quality inspection center" test qualified htf exhaust fan fire, the performance of the leading domestic level. High temperature performance: Fan Test conform GBJ45-82 Fire Code standards, established above the standards of corporate internal control assurance system to run more than 60 minutes continuously under high temperature 300 ℃ conditions, at a temperature of 100 ℃ for 20 hours / time does not damage, widely used in senior civil oven, underground garage, tunnels and other occasions. htf exhaust fan, Chen Yu-conditioned (certified), exhaust fan Dongying City by Wu Chen-yu air-conditioning Limited. Wu Cheng Chen-yu air-conditioning Co. (www.wccykt.com) is an industry leader in Shandong Dezhou, fans, ventilation equipment, over the years, the company implement the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs . Chen Yu-conditioned in leadership with the staff warmly welcome all inquiries negotiations to create Chenyu air conditioning better future.