Fans mainly consists of blade, motor, frame, protect net, bracing cage, shutters. The motor drives blade to c Erformance and characteristic 1. Frame using advanced automatic processing, high precision. Extra-thick zinc coating frame, corrosion resistance strong. 2. High-strength aluminum alloy casting wheel, the reasonable perspective of the type, to reach the maximum air flow. High-precision microcomputer aided manufacturing system can make the best of its fans. 3. Five rigorous quality testing procedures, noise detection, vibration testing, concentric rotation performance testing, speed of blade testing and the whole fan efficiency detection...380V special motor.