MOBILE FANS 20" Mobile Indoor/Outdoor Greenhouse Fan - 240V Greenhouse fan is designed for heavy duty, high moisture laden ventilation and circulation in greenhouses. Housing and fan blades are made of glass filled, high impact polypropylene. Housing includes front and rear wire guards for safety. Housing allows stacking for compact storage. Severe duty, wash-down ball bearing motor is Class F insulated for heat resistance. UL 507 rated for outdoor environments. C-UL recognized. 3 Year Limited Warranty. Horsepower rating based upon maximum speed/load.