Axial-flow exhaust fan fire protection shall be provided the motor insulation and air cooling systems within the wind turbine (using H-class insulation rating of the motor fan forced air cooling system may not be provided). Motor insulation level should not be less than F-level. Axial fire smoke exhaust blower motor power lead, should be inclusive temperature thermal sleeve or use high temperature cables. 1, the fan impeller blade structure type structure should be high efficiency, high intensity. Impeller diameter 630mm or more (including 630mm) of axial fan blades should be made of high-strength aluminum alloy. The bidder shall describe the equipment offered in the form of leaf structure. 2, the motor axial fans should direct drive motor, the motor should be directly exposed to the airflow exhaust fans, centrifugal fans can be belt drive cabinet or direct transmission mode. Fan with motor should be air-cooled, squirrel-cage, totally enclosed damp-heat exhaust fan uses a standard product, with full voltage starting exhaust fan pictures, insulation class F. Exhaust fan motor shall meet the whole exclusion 280 ℃ 0.5h smoke during normal operation. Bearing replacement period of not less than 30,000 hours. Select the device starts the motor to meet the tender requirements, full voltage starting current should be less than 7 times the full load current. 3, vibration tender equipment during assembly and static balance prior to balancing its chassis vibration velocity is not greater than 1.8mm / s exhaust fan service, suppliers should provide the fans supporting the damper and the fastening bolts. 4, manufacturing precision fan casing enclosure shall comply with the relevant specification, the motor bearings inside the casing should have sufficient strength and rigidity to withstand dynamic loads generated by the operation, the height should be maintained motor shaft and housing center agreement. Axial fan casing should be hot-dip galvanizing treatment, the average thickness of the galvanized layer should not be less than 70μm. OK duct cross-sectional area of ??the exhaust fan according to the amount of wind and wind speed (wind speed 10-15 m / s or so). Duct aspect ratio should not exceed 2: 1 (to save material and reduce the drag). Wind speed, wind pipe cross-sectional area, elbows, reducers, etc. to calculate the drag (ie fan static pressure required). Can not claim senior civil use of variable speed or multi-speed drive form, in order to achieve one machine (that usually use through ventilation and fire temperature exhaust) Objective exhaust fan quotes, up Swiss mechanical and electrical (certification) , exhaust fan ventilation and air conditioning provided by the liter Swiss mechanical and electrical equipment factory. L Rui HVAC Electrical Equipment Factory (www.dzsrxfkt.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. In liters Swiss electromechanical leadership with the staff warmly welcome all inquiries negotiations to create liter Swiss electromechanical better future.