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18 4039-150 Rev B 01/04
MONTANA INSTALLATION INSTRUCTIONS
Figure 21 - Factory Built Hearth Extension
Figure 22 - Field Constructed Hearth Extension
WARNING!
Hearth extensions are to be installed only as illustrated to prevent high temperatures from occurring
on concealed combustible materials. Hearth sealing strips prevent burning or hot particles from
inadvertently falling directly on combustible surfaces in the event the building should settle and
disturb the original construction.
14. Hearth Extension
A hearth extension must be installed with all fireplaces to protect the combustible floor in front of the fireplace from both radiant heat
and sparks.
The construction of, and materials used for a hearth extension are shown in Figures 21 and 22. A hearth extension of this construction
may be covered with any noncombustible decorative material and may have a maximum thickness as per the illustration. Seal
gaps between the hearth extension and the front of the fireplace with a bead of noncombustible sealant.
Field constructed hearth extensions should be constructed in accordance with the instructions in Figure 22. The field constructed
hearth extension must be constructed from ½ MICORE CV230, or a material with an equivalent insulation value.