PANEL FANS 50" Belt Drive Fan - Cast Aluminum Blades - 3-Phase Helps cool off environments, keeps out insects and helps dry bedding on floors. Heavy duty galvanized 18 gauge steel with cast steel pulleys. Enclosed, maintenance free motors have sealed ball bearings for long life and automatic thermal overload protection. X-frame reinforced for strength and rigidity. 3 cast aluminum blades with a Lifetime Limited Warranty. Includes a spring belt tensioner and has pre-lubricated, permanently sealed bearings that are rubber mounted for smooth operation and long life. UL listed. Fully Assembled. Horsepower rating based upon maximum speed/load.