With the AGA approved Fire Oak style of Vent-Free Gas Logs, woodburning fireplaces can become vent-free systems. Vent-Free Gas Logs lower heating costs two ways - they require about half the fuel of conventional gas logs, and they operate with the damper closed. This means you're sending the heat into the room, not up the chimney - a definite plus with fuel cost so high. Each system uses clean-burning natural gas and comes complete with refractory ceramic logs and ember base, high-efficiency burners, oxygen depletion sensor, safety pilot control, convenient spark ignitor, pedestal grate, grate facing, and adjustable heat control valve