Charmglow Vent- Free Propane Gass Blue Flame Heater 10000BTU CGL100MB Easy to Use (Top mount controls for convenient access); Includes Wall and Floor mounting hardware Oxygen Depletion Sensor (for additional safety) Push- Button Ignition (for matchless start) 99.9% efficiency (no outside duct or vent needed) Diamond mesh screen (For additional heat protection)