This drawing shows a fireplace WITHOUT a mantel. A review of these dimensions should help determine if you can use a standard dimension unit or need a custom mantel.

A: facing outside width  B: facing outside height  C: facing thickness  D: facing inside width  E: facing inside height  F: hearth width  G: hearth depth  H: hearth side projection  I: hearth height  J: height clearance  K: side clearance right  L: side clearance left
Refer to standard dimensions chart to determine the following:
Side facing reveal	[1/2 of mantel inside width “Q” – facing inside width “D”]
Top facing reveal	[mantel inside height “R” – facing inside height “E”]
Shelf height above floor	[mantel height “U” + hearth height “I”]
Hearth width clearance	[1/2 hearth width “F” – mantel footprint “Z”]
Facing width clearance	[facing outside width “A” must be at least 2” less than mantel footprint “Z”]
Facing height clearance	[facing height “B” must be at least 10” less than mantel height “U”]
Shelf side clearance	[measure 1/2 of mantel shelf length “W” from center of facing inside width to determine left and right side clearances]