Matrix Insert Installation and Operation Manual
34 ______________________________________________________________________________
8.3 COMPLIANCE OF A COMBUSTIBLE MANTEL SHELF
To ensure compliance of an existing mantel shelf or to install a combustible mantel shelf, refer to
table and figure below. For example, a mantel shelf with a 8’’ depth (203 mm) ((X) value) must be
installed at least 19 1/2" (495 mm) ((I) value) above the top of the insert (see figure below).
Different mantel shelf dimensions are listed in the following table. However, no combustible
mantel shelf can be installed at less than 19 1/2" (495 mm) above the top of the insert. If the
depth of the mantel shelf is not listed in the table below, add 11 1/2" (292 mm) to the depth of
your mantel shelf to obtain the safe positioning of your mantel shelf. For example, for a 9" (229
mm) mantel shelf, the safe positioning would be 20 1/2" (521 mm) above the top of the insert (11
1/2" (292 mm) + 9" (229 mm)).
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