Duluth Forge 210049 Gas logs, Oak 33,000 maximum BTU heats up to 1,300 square feet of living space Patented Dual Fuel Technology operates off Natural Gas or Liquid Propane Minimum firebox size required: 20 H x 28 W in front (23 W at rear) x 15 D LCD remote control screen display Remote controlled unit features O.D.S. (Oxygen Depletion Sensor) safety assurance with automatic shut-off function