The DVAG11N Direct Vent Wall Heater from Ashley Hearth Products makes the perfect solution for zoned heating. The space saving direct vent furnace design mounts to an exterior wall and the adjustable vent assembly adjusts to fit walls from 4-1/2 inches to 10 inches thick. For clean comfortable heat when and where you want it the gas flame is completely sealed inside away from all contact with room air. Air necessary for combustion is drawn into the chamber from outside through the vent and combustion products are vented directly to the outside. Windows and doors stay closed because no room air is used for combustion. The DVAG11N direct vent natural gas wall furnace is designed to heat up to heat up to 200 Sq. Ft. and has an 11000 BTU input.