Durable: firm structure Colors:yellow ,red, blue, ect. Size:8" 12" Voltages: 110v 220v Speeds:2800r/min or 3300r/m Frequencies: 50Hz or 60Hz Main material: shutter:dia-cast aluminum alloy,fan body and cover:galvanized steel,handle: die-cast plastics,cable length:3m motor: aluminum alloy,explisve switch,with America,Japan,Europe,Taiwan styles' plug for choosing. Application: The ventilator adopts die-cast aluminum alloy blad with gradual twisted airfoil cross section.and the ventilator can be equipped with two kinds of foot rests,one is fixed rest and the other is movable rest.which has a durable and firm structure, with good insulation, high pressure and large air volume. Portable ventilator connect with flexible duct,with easy to carry characteristics, It can be used in shipbuilding,basemant,tunnel,mining,underground project,chamical lab, extraction and refinement of petroleum,making of various kinds of benzene,alcohol and medicine,painting,rubber producing and so on,related factroy,workshop,warehouse for ventilating.