1.OEM 2. Quality control and prefential price 3. Size:135*135*40 4 .Voltage:115V/230V/380V 135*135*40 mm ventilation exhaust ac fan,cooling fan Electric moltor:Shaded pole type AC electric motor designFrame:High quality aluminum alloy outside frame Anti-corrosive and moisture proof structureImpeller:UL-0 70% PBT+30FRP.Bearing:self lubricating bearing and ball bearing Insulation:class BInsulation ...