Durable: firm structure Colors:yellow ,red, blue, ect. Size:8" 10"12" 14"16" Voltages:36v 110v 220v 440v 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,with America,Japan,Europe,Taiwan styles' plug for choosing. Application: The portable propeller 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 to ventilate a close space.