portable fan, blower 1,casing: steel; blade:aluminum 2,large air volume, ... Portable fanPortable blower, Portable ventilator(portable blower,air blower,exhaust fan) Size:8" 10"12" 14"16" 18" 20" Colors:yellow ... , blue, ect.Main material: shutter: 7pcs dia-cast aluminum alloy,fan body and cover:galvanized steel,handle: die-cast plastics,cable ...