Reduce heat stress and improve air quality with Schaefer's uniquely designed circulation fans. Unrivaled in the market, these fans are engineered to produce greater air movement and superior cooling no matter the application. You don't hear them. You don't see them. You only feel them! also known as horizontal air flow (HAF) fans, these fans move air in a coherent horizontal pattern creating a gentle 'racetrack' airflow pattern needed in greenhouses to maximize heat distribution and humidity control by mixing the air, from ceiling to floor. Schaefer Versa-Kool® Air Circulator Fan, 1-Phase Fixed, 14850 cfm, 825 RPM Speed, 1/2 HP Power, 115/230 VAC, 7/3.5 A, 60 Hz Frequency, 1 Speed, 3 Blades, 27 cfm/W Air Flow Efficiency, Direct Drive Control, Galvanized Steel Blade, Totally Enclosed Motor, Deep Guard, Polyethylene/Powder Coated Steel Housing Material, Ceiling/Floor Mounting, 42 in Dia Dimensions, Domestic