A direct-drive high-volume, low-speed (HVLS) fan produces no noise and uses no oil. The fan has three Propell-Air blades, and comes standard with 24-ft.-dia. blades. Other blade sizes available include 20-, 16-, 12-, and 8-ft. dia. The fan circulates a large volume of air as much as 85 ft. from its center in all directions for optimum heating or cooling of an area encompassing as much as 22,000 sq. ft. Air is directed outward from the center in a conical shape, eliminating dead-air holes directly beneath the fan and in building corners.