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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 specifi 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.).