cross flow impeller 1.small size,easy to installation 2.low noise ... bearingOil bearing 15000 hoursCharacteristic.The company of cross-flow fan diameter from 25mm to 150mm, from 50mm to 1150mm ... to customer needs, choose the most suitable specifications.Cross flow fan using aluminum alloy materials, light weight, large air volume, ... 42W, blade diameter 50MM, length 42CM:. high quality cross flow impeller