... 3.reliable operation 4.excellent functionin cross flow impellerFan material: aluminum alloyBearing: ball bearings ... needs, choose the most suitable specifications.Cross flow fan using aluminum alloy materials, light weight ... noise, high strength, low vibration, high Wen Jia, long life advantages.The perspective of cross-flow fan ... 42W, blade diameter 50MM, length 42CM:. high quality cross flow impeller