Exhaust fan installation and maintenance: a kitchen fan is indispensable key kitchen equipment, it is recommended not to install in the ceiling as possible, to be installed in the engine room, the roof or exterior wall to facilitate maintenance of the place. Second, the kitchen fan because of long working hours in hot, humid, gas fumes. Regular maintenance is indispensable work. Point of failure: 1, the impeller blade curvature oily lead angle deformation, the air volume decreased significantly total pressure parameters, reach smoke requirements. 2, the impeller oil stains cause impeller to lose balance, increased vibration, bearing damage. 3, harsh environments parts easily rust, damage the fan. Axial fire exhaust fan should be set to protect the motor insulation and air cooling systems within the fan (using H-class insulation rating of the motor fan forced air cooling system may not be provided). Should not be less than the motor insulation class F grade. Axial fire exhaust fan exhaust fan motor power inverter lead a preferred supplier by temperature or the use of high temperature thermal sleeve inclusive cable. A leaf blower impeller 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 structure in the form of tender leaves of the device. 2, axial fan motor should be used direct drive motor, the motor should be directly exposed to the air flow, centrifugal blower cabinet can belt drive or direct drive mode. Fans should be equipped with air-cooled motor, squirrel-cage, closed humid type of standard products, with full voltage starting frequency exhaust fan mainstream choice, insulation class F. Exhaust fan motor should satisfy the exclusion of 280 ℃ smoke machine during normal operation 0.5h. 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 not be greater than seven times the full load current. 3, the damping device in the assembly process tenders frequency exhaust fan, static balance prior to balancing its chassis vibration speed is not greater than 1.8mm / s frequency exhaust fan leading technology supplier shall provide the fans supporting damping and tighten bolts. 4, manufacturing precision chassis fan casing shall comply with the provisions of the relevant norms, within the motor bearing housing should have sufficient strength and rigidity to withstand dynamic loads generated by the operation, the height should be maintained motor shaft and housing center unanimously. Axial fan casing should be galvanized treatment, the average thickness of the galvanized layer should not be less than 70μm. The best choice for frequency exhaust fan, rose Swiss electrical, Shaanxi frequency exhaust fan ventilation and air conditioning by up Swiss Mechanical and Electrical Equipment Factory available. L Rui HVAC Electrical Equipment Factory (www.dzsrxfkt.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. L Swiss leader in mechanical and electrical staff warmly welcome all inquiries negotiations to create liter Swiss electromechanical a better future.