... ,less vibration 3.reliable operation 4.excellent functionin cross flow impellerFan material: aluminum alloyBearing: ball bearings ... low noise, high strength, low vibration, high Wen Jia, long life advantages.The perspective of cross-flow fan and ... Blower motor shaft by the use of security film of oil, a fuel-free life of ... 40 / 42W, blade diameter 50MM, length 42CM:. high quality cross flow impeller