The industrial confined space fan is the only 12 in. diameter industrial confined space fans with a variable speed control switch in the air mover market. Featuring a low amp draw and powerful sealed motor, it delivers dry air for ventilation, drying or exhaust fan jobs. This unit can be used without hoses to create negative air pressure and air circulation in gyms, hallways and other large areas. Ventilate any narrow space including subterranean manholes and sewers up to 125 ft.