... using, movable operation 3.W or A Supporter Portable Blower (8",10",12",14",16",18")1.Aluminum Blade, Metal Frame2 ... pressure under long distance6.Suitable for underground, telecommunication, reparing tunnel project and ect ModelSize(mm)Voltage(V)PhaseFrequency(hz)Power(w ... SHT-40242752x49x50220440520 SHT-452931.552x49x50180360430 59x55x48 SHT Series Portable Blower(8",10",12",14",16",18")