This doorset is a wood burning heating unit. It has upper air valves and an air wash for clean efficient wood burning. The 3" main frame is made to overlap the fireplace as much as possible in order to achieve more width of glass. The doors are very slender in front view, only 1/2", but are 1" deep, the outside of each door frame is 1.5" deep and sticks out of the surface to carry the hinge line for the custom hinges. The main frame and the doors are antiqued nickle.