25,000 BTU Direct Vent Propane HeaterThe DVAG30L 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 in. to 10 in. 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