Matrix Insert Installation and Operation Manual
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8.4 POSITIONING THE UNIT
It is necessary to have a floor protection made of non-combustible materials that meets the
measurements specified in table “FLOOR PROTECTION” (see Section 8.5. To determine the need
to add floor protection (D) beyond the hearth extension, you must do the following calculation
using the data in Table Data for floor protection calculation of this section: D = B - (A - C). If the
value (D) is negative or zero, you do not have to add more floor protection in front of the unit,
because the masonry fireplace hearth extension is large enough. If the value (D) is positive, you
will need floor protection in front of the hearth extension at least equivalent to the result (D).
Here is a sample calculation to determine the need to add a non-combustible materials floor
protection. For someone living in the USA whose insert would protrude 3" (76 mm) into the room
(C) the calculation would be:
Value D = B - (A - C)
Value D = 16" - (16" - 3")
Value D = 16" - 13"
Value D = 3"
Non-combustible floor protection of at least 3" (76 mm) in depth must be installed in front of the
fireplace hearth extension.
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