"The TPI air curtain works wonders at keeping outside air out and inside air in. Features discharge vanes that extend the entire length of the curtain and adjust to optimize airflow performance. U.S.A. Assembly Required No, Common Usage Maintains environmental separation w/a light flow of air, HP 1/2, Air Delivery CFM 931/6,544 low/high, Amps 3.8/4.4 Low/High , Mounting Type Above window or doorway, Speed RPM 562/1,636 Low/High , Thermal Overload Protection Yes, Variable Speed Yes, Material Type 20-ga. rigid steel, Mount Height in. Up to 120, Volts 120V, Watts 199/509 Low/High , Finish Type Powder-coat. Motor is double insulated for quiet operation Motor includes a quick-disconnect to allow for easy installation and service Heater module available"