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 operation, in order to meet the needs smoke, while the fire smoke No action exhaust pipe smoke damper partition and make air duct smoke damper was smoke and makeup air, automatic fire dampers exhaust smoke partition other two-speed exhaust fan in high-rise building fire smoke extraction system Applications for the high-level basement usually work state exhaust ventilation and accident two-speed, two-speed asynchronous motor is particularly suitable. Two-speed fan running at high speed into a low-speed synchronous speed improve a lot, but also a corresponding amount of exhaust greatly improved exhaust fan factory, then the system immediately replaced by the exhaust smoke condition. But in the design process, will encounter Electric two-speed fan exhaust fan price control problem, that is how to solve the motor windings from Δ-connected to a dual-Y-connected conversion and interlocking, automatic fire linkage and Manual control; blower protection shutdown and how to maximize the protection of reliability in high speed accident in smoke, how to ensure that the power supply and other issues. Exhaust fan for the selection of the main control parameters temperature, air flow, total pressure, efficiency, noise, electrical power, speed and shaft power. Exhaust fan at a temperature not higher than 85 ℃ conditions should be long-term normal operation. Exhaust fan shall ensure that: When the transmission medium at a temperature of 280 ℃ continuous work 30min exhaust fan applications and medium temperature cooled to ambient temperature still continuous running. At rated speed in the work area exhaust fan, fan pressure curve measured with the description given in the curve should meet the following requirements: axial-flow exhaust fan at a predetermined flow rate, corresponding to the pressure deviation of ± 5%. Centrifugal exhaust fan at a predetermined flow rate, corresponding to the pressure deviation of ± 5%. Exhaust fan exhaust fan _ quote _ Chen Yu Yushu conditioned by Wu Cheng Chen-yu air-conditioning Limited. Wu Cheng Chen-yu air-conditioning Co. (www.wccykt.com) strong, credible, Shandong Texas fan, ventilation equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Chenyu into the brilliant air conditioning and you work for a better future!