Opening Width (B) should be equal to or less than your (K) measurement. If it is less than please keep in mind that you should have a bare minimun of 6 inches of facing material between the firebox opening and the inside of the mantel leg. Also, pay attention to the body width measurement (D) to make sure to total width of the mantel will work for your application.
Opening Height (C) should be equal to or less than your (K) measurement. If it is less than please keep in mind that you should have a bare minimun of 6 inches of facing material between the firebox opening and the bottom of the breast portion of the mantel. Also, pay attention to the Overall Height measurement (E) to make sure to total height of the mantel will work for your application.
Return
depth (G) should equal your (M) measurement + 1/4 inch.
For example, if your facing material depth is 3/4" you would order a 1" return depth. This should allow adequate clearance for uneven facings. If your facing is stone you may need to allow even more room for the return depth.
Scribe molding is sent along with your mantel to "finish off" the area where the interior legs and bottom breast board meets your facing material.
More questions? To understand more about mantel measurements
please visit the mantel installation page - click
here.