Portable Ventilation Fans Lightweight and portable with carry handle. Ventilate and cool manholes, tanks and crawl spaces. Rubber feet minimize noise and vibrations. 115V. Ducting is 2-ply reinforced polyvinyl. Withstands -20° to 180°F. Flame retardant. Features 20" diameter galvanized steel blade fan, powered by a 1 HP motor and includes 20' of lightweight flexible tubing. Heavy gauge aluminum fan housing. Powder coat safety blade guards, 10'L cord, cord wrap and carry handle. Horsepower rating based upon maximum speed/load.