Heat & Glo • Multi-Sided Woodburning Fireplace • 34977 Rev T • 11/07
28
Metal strips 2 in. (51 mm) under the edges
of the fireplace and must extend beyond the
front and side openings by 2 in. (51 mm)
1 in. (25 mm)
overlap
Figure 8.2 Positioning the Protective Metal Hearth Strips
A
B
C
Figure 8.3 Hearth Extension Dimensions
Fire Risk
• Hearth extensions must be installed
exactly as speci
fi
ed.
High temperatures or hot embers may ignite
concealed combustibles.
WARNING
CAT. #
A
B
C
HX3
in
52
16
8
mm
1321
406
203
B. Finishing Material
• Combustible
Material
Material which is made of or surfaced with wood,
compressed paper, plant
fi
bers, plastics, or any material
capable of igniting and burning, whether
fl
ame proofed or
not, plastered or not plastered.
• Non-Combustible
Material
Material which will not ignite and burn. Such materials are
those consisting entirely of steel, iron, brick, tile, concrete,
slate, glass or plasters, or any combination thereof.
Materials that are reported as passing
ASTM E 136,
Standard Test Method for Behavior of Materials in a
Vertical Tube Furnace at 750° C
, shall be considered
non-combustible materials.
• Non-Combustible Sealant Material
Sealants which will not ignite and burn: Rutland, Inc.
Fireplace Mortar #63, Rutland 72R, Nuflex 302, GE
RTV106, GE RTV116.
After completing the framing and applying the facing material
(drywall) over the framing, a bead of non-combustible seal-
ant must be used to close off any gaps at the top and sides
between the
fi
replace and facing to prevent cold air leaks.
Large gaps can be bridged with
fi
berglass rope gasket.
Only non-combustible materials may be used to cover the
metal
fi
replace front.
Fire Risk
• Maintain
clearances.
• Use only non-combustible material below
standoffs, material such as cement board is
acceptable.
WARNING
• Framing
or
fi
nishing material used on the front of, or
in front of, the appliance closer than the minimums
listed, must be constructed entirely of noncombustible
materials (i.e., steel studs, concrete board, etc.).