By delivering a remarkable 71.1% efficiency rating, the Freedom wood insert reigns as the most efficient large insert on the market. It is the only wood insert of its size that can either mount flush (a good way to go if used as a room heater or for backup heat) or extend the insert 7 inches onto the hearth (which provides a great cooking surface). The Freedom wood insert is adaptable to many fireplaces because the firebox is tapered to fit the widest possible range of fireplace openings. The Freedom wood insert can also take a 24-inch log, making overnight burns easier than before.