... your need,pls contact us portable ventilator, portable blower, portable fan, blowerColors: yellow, blue., redSize:8" Voltages:110v-220v Speeds ... fighting, piping construction and in other violent working situation for ventilator. with good insulation, high pressure and large air volume character. ... ,warehouse to ventilate waste air,harmful gas,dust ect. good quality air blower for underground project