1)air conditioner 2)Strong resistance to corrosion 3)Large air volume, low noise 4)Long service life Qingzhou Huinong Machinery ... :Made from high-quality galvanised steel sheets in order to assure the highest strength and strong resistence to corrosion.3)Blades:6 ... by aluminium magnesium alloy in jection, light weight, high strength.5)Bearing:High speed ,high strength ,low noise and long service life ...