TPI Air Circulator Heads feature two-speed, 115V, 1ph. ball-bearing, totally enclosed motors, spider aluminum blades, pull-chain switch, and 18'L cord with 3-conductor plug. High-Performance and Commercial head models run efficiently in temperatures up to 135°. Fan heads meet OSHA regulations and are UL listed. High-Performance Industrial Fan Heads feature a 1/3 HP motor. Includes chrome-plated fan guard, three blades, and three-year limited warranty. Commercial Fan Heads run on a 1/4 HP motor and include chrome-plated fan guard, three blades, and one-year warranty. Heavy-Duty Fan Heads include a 1/2 HP motor, yellow powder coat fan guard, four blades, and five-year limited warranty. Air circulator mounts are sold separately.