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