The Vail 32 Series of vent-free fireplaces are zero clearance certified and offer 99% fuel-efficiency. They operate by drawing in the room's existing air, and then heating and re-circulating the warmer air back into the room for maximum comfort. An oxygen depletion sensor and automatic shut-off control ensures safety. The Vail 32 vent-free model is a 32,000 Btu fireplace and includes brick liner and gas logs as shown.