"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. Heat Settings 3, Heating Capability sq. ft. 5,900, Oxygen Depletion Sensor No, Blower Included No, Product Type Radiant heat, BTU Output 250,000, Clearance from Rear Wall in. 72, Needs Direct Venting No, Thermostat Included No, Clearance from Side Wall in. 72, Dimensions L x W x H in. 14 11/16 x 14 11/16 x 44 5/16, Igniter Continuous spark. 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"