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DETERMINING THE MANTLE OPENING HEIGHT "B"

The opening height of the mantle of "B" dimension is determined by measuring the height of the fireplace facing material and subtracting 1/2"  inch from the height to allow the mantle to overlap the facing material. SEE FIG.1

DETERMINING THE MANTLE OPENING WIDTH "C"

To determine the opening width of the mantle of "C", measure the width of the facing materials and subtract one inch. This allows the mantle to overlap the facing material 1/2" on each side. You can overlap the facing material up to one inch less than the width of the mantle leg if needed. SEE FIG.1

DETERMINING THE RETURN DEPTH "G"

All fireplaces have a front or face made of non-combustible material such as brick, tile, marble or slate. This facing material brick, tile, marble or slate) may be installed flush with the wall of the fireplace or it may protrude in front of the fireplace wall. The distance the facing material sticks out in front of the wall is used to calculate the mantle return depth or "G" measurement. SEE FIG.1 The return dimension or "G" you need to specify is calculated by adding 1/4"   inch to the thickness of the facing material protrusion. Therefore, if you are installing the mantle over 3/4"  inch thick marble you should specify a return depth G of 3/4" inch plus 1/4" inch or G = 1 inch. SEE FIG.1

READY TO ORDER?

Once you determine your opening Height "B", Opening Width "C" and Return Depth  you can determine all the dimensions of your mantle using the Mantle Specification Table. You should always check to make sure that the mantle Shelf Length "D" and the mantle Body Width "E" will fit your situation. The shelf length can be a limiting factor when installing the mantle between two windows or a window and a door. Make sure you have the space needed for the size mantle you are ordering. See your Premier Mantle Dealer for details. SEE FIG.1

CALCULATING CUSTOM  MANTLE DIMENSION

When you customize your mantle opening, you also change the overall Shelf Length "D", Body Width "E", and Overall Height "A". To determine your custom sizes, use the following table and formulas.  SEE FIG. 2.  Measure your B (Facing Height) and C (Facing Width) from Step 1 and 2 Example B = 39, C,51.