A.The outline border has adopted advanced automatically-manufactured techniques with extremely high accuracy, specially thick galvanized layer with extremely strong resist. B. High strength aluminum-magnesium alloy die-casting wheel;New distorbed stamping molding fan leaf; Reasonable leaf angle, achieved the biggest air flow; High precise microcomputer aided manufactured systems will allow fans to maximize efficiency. C. Five strict quality testing procedures:Noise Testing; Vibration Testing; Rotational Care Performance Testing; Speed of Fanleaf Blower Testing; Overall Machine Efficiency Testing; High-Performance 380v special motor. D. The use of stainless steel fanleaf , without distortion, no breaking, aesthetic durability, radically improve aluminum fanleaf fracture problem. E. Adopted automatic belt up and tight so that don't pine belt and drop belt, efficienct lower fan failoure rate. F. More strengthening rebar pulley:After sandblasting, improve aesthetics, eliminate stress, increase strength. Paper carton