Colors:yellow ,red, blue, ect. Size:8" 10"12" 14"16" 18" 20" Main material: shutter: 7pcs 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. can be equipped with wheel for big model, which has a durable and firm structure,it can move easily. Application: Our SHT series portable propeller ventilator has many strong points such as excellent function,light weight, novel design,special manufactured for underground cable maintainance,shipping making,exhaust for fire fighting, piping construction and in other violent working situation for ventilator. with good insulation, high pressure and large air volume character. Portable ventilator connect with flexible duct,with easy to carry characteristics, It can be used at tunnel, basement, ship building or welding, laboratory ,warehouse to ventilate waste air,harmful gas,dust ect.