You can select a fireback up to the width of your fireplace’s back wall. (Sometimes that is the same width as your fireplace opening and other times the firebox tapers, so the back wall is narrower.) If for example, the back wall of your fireplace is 22 inches wide, you can safely use a fireback up to 22 inches wide.

Do I need feet for my fireback?

If you intend to sit it flat against the back wall and have a heavy grate to hold it vertical, no you do not need the feet. … They are designed to either lean the fireback back against the back wall to hold it in place or lean it forward to direct more heat into the room.

Does a fireback really work?

Do firebacks really work? The effect of a fireback behind a fire is immediately tangible. A fire without a fireback hardly radiates any warmth, while a fire with a fireback very much does so. There is more radiation if the fireplace fireback is larger or thicker, and a thicker fireback retains heat longer.