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