The Expedition II steel wood insert provides a great value for those looking for the easiest wood insert to operate. Powered by the Quadra-Fire four-point burn system providing an impressive fire that can be easily seen through the large 275 sq.in. cast iron glass door. Along with the Automatic Combustion Control (ACC), which gives you more air when you want it for easier start up or that extra boost of heat when needed. This is done automatically once you set the ACC so no need to stick around and tend the fire, just enjoy the heat.