... fan and blower, external rotor axial fan,ventilation fan, Duct fan, shaded pole motor, external rotor fan motor,aluminum die casting parts, stator and rotor, Developing moulds and ... efficiency: our fan adopted the specical design to keep the best banlance betwwen Air flow and Noise. 2 ... 68L15P2-140-21.YWSCF: Asynchronous Single Inlet Centrifugal fan and blower2.D: Single-phase capacitor operation S: ...