... noise,well anticorrosive. CWZ Series Small-sized axial flow fan 1,GeneralCWZ series marine small sized axial fans are suitablefor ventilation ... speed & length of the vanes, the fans have low noixe, small size, tight weight, stable performance, ect.In the course of ... we had thought fully of the marine special conditions , the impellers are strictily made by dynamic balance adjustment & over speed test ...