pvi3618-x the 36′ pvi series portable box fan is one of the most dependably built belt drive air circulators on the market. It is an excellent choice for machine shops, gyms, factories, or any location requiring portable air movement. It features heavy-duty intake and exhaust guards, and a rugged, heavy gauge galvanized housing. It employs a rolled inlet powder coated venturi to improve airflow in the box housing. It features a unique automatic belt tensioner that lengthens the life of the belt and motor while eliminating the belt and motor while eliminating the need for constant maintenance. The side ergonomic handles and two fixed and two swivel casters make it easy to maneuver. The belt drive open drip proof 3 hp motor is 230/460-volt three phase.