1.High quality exhaust fan 2.With Zinc plated or stainless steel fan blade. 3Can be used in the workshop,farm,garden 1The outline border adopts advanced automatic process, more accuracy, material adopt zinc coat and zinc plate. 2The aluminum metal alloy of the high strength hub, adopts aviation aluminum magnesium metal alloy, light weight, high strength, good tensile.3Strap adjust automatically, ...