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PART B – INSTALLATION
4.3 POSITIONING THE UNIT
It is necessary to have a floor protection made of non‐combustible materials that meets the
measurements specified in this section. See the 2 Tables at the end of this section, to determine
the need to add floor protection (D) beyond the hearth extension, you must do the following
calculation using the data in one of the 2 Tables 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 4" (76 mm) into the room
(C) the calculation would be:
Value D = B ‐ (A ‐ C)
Value D = 406 mm ‐ (406 mm – 102 mm)
Value D = 406 mm – 304 mm
Value D = 102 mm
Non‐combustible floor protection of at least 102 mm in depth must be installed in front of the
fireplace hearth extension.
If the extension of the masonry hearth is raised at least 203 mm (F) from the floor protection, a
non‐combustible material without an R factor extending 406 mm from the front of the insert is
required.
Destination 1.5 Insert Installation and Operation Manual
23
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