... alloyBearing: ball bearings or bearingMotor capacitor type: AC, AC, DC shaded-pole without carbon brush type or DC carbon brush typeInsulation class ... using aluminum alloy materials, light weight, large air volume, low noise, high strength, low vibration, high Wen Jia, long life advantages.The perspective ... -050A: 110 / 220V 40 / 42W, blade diameter 50MM, length 42CM:. high quality cross flow impeller