"This HeatStar High-Intensity Infrared Propane Heater provides quiet, clean heat for pole barns, factories, warehouses, loading docks and more. U.S.A. Clearance from Corner in. 46, Oxygen Depletion Sensor No, Thermostat Included No, Heating Capability sq. ft. 1,200, Igniter Spark ignition, Needs Direct Venting No, Gas Inlet in. 1/2, Blower Included No, Clearance from Rear Wall in. 46, Dimensions L x W x H in. 60 1/2 x 21 1/2 x 11, Product Type Radiant heat, BTU Output 100,000, Clearance from Side Wall in. 46. 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"