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Heatilator • FL92 Installation Manual • 4012-081 • Rev C • 10/03/13
Noncombustible
Framing Material
HX4 or
equivalent
Figure 7.6 Raised Platform Hearth Extension-Framing
Non-combustible
Finishing Materials
Figure 7.7 Raised Platform Hearth Extension-Finishing
Floor
Noncombustible
Framing Material
Noncombustible
Finishing Material
Protective Metal
Hearth Strips
1/2 in. Micore
or equivalent
insulation
20 in. Min.
Hearth Extension
Note: The bottom of the grill is
5 3/4 in. (146 mm) above the
bottom of the fireplace. Finished
hearth must NOT extend above
this level.
Figure 7.5 Raised Platform Hearth Extension Detail
1. Fireplace Installed Flush on the Floor and
Hearth Extension Raised to Bottom of Firebox
Opening
Non-combustible flooring a minimum of 20 in. (508 mm)
in front of and 12 in. (305 mm) to each side of the fuel
opening is required.
The hearth framing must be constructed of non-com-
bustible materials (such as metal framing or equivalent
material) and placed on HX3(s), HX4(s), or equivalent
material. See Figures 7.4 and 7.5.
When creating the platform, allow for the thickness
of the non-combustible finishing materials
.
Seal gaps between the hearth extension and the front
of the fireplace with a bead of non-combustible sealant
or grout.
2 in. (51 mm)
required
Continuous,
non-combustible sealant
Tile, stone or other
non-combustible material
Floor constructed of wood or
other combustible material
1/2 in. Micore
Hearth Ext
or equivalent
insulation
(see Table 11.2)
Fireplace Protective
Metal Hearth
Strip
Figure 7.4 Hearth Extension Construction