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20 17335 Rev L 07/04
E36/39/42 INSTALLATION INSTRUCTIONS
Figure 17 - Factory Built Hearth Extension
Figure 18 - 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.
17. 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 17 and 18. 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 18. The
field constructed hearth extension must be constructed from 1/2 in. MICORE CV230, or a material with an equivalent
insulation value.
Cat # A B
E/EC36
52 in.
1321 mm
16 in.
406 mm
E/EC39
52 in.
1321 mm
16 in.
406 mm
E/EC42
66 in.
1676 mm
20 in.
508 mm