... 1.small size,easy to installation 2.low noise,less vibration 3.reliable operation 4.excellent functionin cross flow impellerFan material ... alloy 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