"This HeatStar High-Intensity Infrared Propane Heater provides quiet, clean heat for pole barns, factories, warehouses, loading docks and more. U.S.A. Thermostat Included No, Clearance from Side Wall in. 46, Blower Included No, BTU Output 120,000, Clearance from Corner in. 46, Clearance from Rear Wall in. 46, Product Type Radiant heat, Dimensions L x W x H in. 82 1/2 x 21 1/2 x 11, Gas Inlet in. 1/2, Heating Capability sq. ft. 3,000, Needs Direct Venting No, Oxygen Depletion Sensor No, Regulator Included Spark ignition. No direct venting required Additional burner orifices enables the installer to increase or decrease the heat output Spark ignition heaters ship with 40VA transformer Millivolt control heaters shipped with thermostat Noncorrosive materials are used throughout heater construction"