cross flow impeller 1.small size,easy to installation 2.low noise,less vibration 3.reliable operation 4.excellent functionin cross ... the most suitable specifications.Cross flow fan using aluminum alloy materials, light weight, large air volume, low noise, high strength, low vibration, high Wen Jia ... -050A: 110 / 220V 40 / 42W, blade diameter 50MM, length 42CM:. high quality cross flow impeller