... axial fan,ventilation fan, Duct fan, shaded pole motor, external rotor fan motor,aluminum die casting parts, stator and rotor, Developing ... and scientific management, "low noise, high air volume, stable running and long life time" Fans has been developed, Which is ... Centrifugal fan and blower2.D: Single-phase capacitor operation S: Three-phase3. 68: Motor air gap diameter4. L15: Core length code5 ...