"This Dyna Glo Delux Natural Gas Radiant Heater instantly heat areas up to 5900 square feet with 250,000 BTU of clean, efficient radiant heat. Thermostat Included No, Igniter Continuous spark, Clearance from Rear Wall in. 72, Heating Capability sq. ft. 5,900, Product Type Radiant heat, Clearance from Side Wall in. 72, Blower Included No, Heat Settings 3, Oxygen Depletion Sensor No, Needs Direct Venting No, Dimensions L x W x H in. 14 11/16 x 14 11/16 x 44 5/16, BTU Output 250,000. Rugged stainless steel emitter and steel mesh caging Flame out sensor, auto safety shutoff and a large, stable base CSA certified Always be sure that the proper ventilation is being provided"