cross flow impeller 1.small size,easy to installation 2.low noise,less vibration ... from 25mm to 150mm, from 50mm to 1150mm length can be produced according to customer needs, choose the ... light weight, large air volume, low noise, high strength, low vibration, high Wen Jia, long life advantages.The perspective of ... / 220V 40 / 42W, blade diameter 50MM, length 42CM:. high quality cross flow impeller