"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 100,000, Clearance from Corner in. 46, Clearance from Rear Wall in. 46, Oxygen Depletion Sensor No, Dimensions L x W x H in. 60 1/2 x 21 1/2 x 11, Gas Inlet in. 1/2, Heating Capability sq. ft. 1,200, Igniter Spark ignition, Needs Direct Venting No, Product Type Radiant heat. No direct venting required Additional burner orfices 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"