... ,with CE certificate Portable ventilator(portable blower,air blower,exhaust fan) Size:8" 10"12" 14"16" 18" ... Main material: shutter: 7pcs dia-cast aluminum alloy,fan body and cover:galvanized steel,handle: die-cast ... ,special manufactured for underground cable maintainance,shipping making,exhaust for fire fighting, piping construction and in other ... harmful gas,dust ect. portable ventilator (exhaust fan)