Martin Fireplace's MD421 woodburning fireplace offers a 20 1/4 in deep firebox with a 36-in. or 42-in. opening. No visible smoke baffle is designed to make this prefabricated fireplace look and feel just like its masonry counterpart. The fireplace includes interior brick pattern highlighted by detailed mortar joints. A radiant design also allows non-combustible material to be installed up to the firebox opening and provide the look of a traditional masonry fireplace.