Heatilator • EL36/EL42 • 4044-132 Rev P • 02/07
27
Fire Risk
• Metal hearth strips MUST be installed.
Sparks or embers may ignite
fl
ooring.
WARNING
Figure 2
Place Metal Hearth Strips
Metal Hearth Strips
Metal hearth strips are placed 2 in. (51 mm) under the front
of the
fi
replace and must extend beyond the front and sides
of
fi
replace opening by 2 in. (51 mm). The metal strips must
overlap by 1 in. (26 mm) minimum.
Hearth Extension
If not using an HX3 or HX4 hearth extension, refer to Sect.
A and Table 1 for substitute material.
HX3 or HX4
Figure 3
Hearth Extension, HX3 or HX4
The hearth extension must be covered with non-combustible
materials as illustrated below in Figures 4 and 5.
• Non-Combustible
Materials
Material which will not ignite and burn. Such materials
are those consisting entirely of steel, iron, brick, tile, con-
crete, slate, glass or plasters, or any combination there-
of.
Materials that are reported as passing ASTM E 136,
Standard Test Method for Behavior of Materials in a Ver-
tical 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 76R, Nu
fl
ex 304,
GE RTV106 or GE RTV116 (or equivalent).
4 in. (102 cm)
minimum
HX3 or HX4
covered with
non-combustible
facing
See Figure 5
for detail
Figure 4
Hearth Extension
2 in. (51 mm) of the Protective
Metal Hearth Strip is required
under the front of the fireplace
High temperature
(300°F min.) continuous,
non-combustible sealant
Tile, stone or other
non-combustible material
Floor constructed of wood or
other combustible material
HX3 or HX4
Hearth Ext
or equivilent
insulation
(see Table below)
Fireplace
Opening
4 in. (102 mm) min.
Figure 5
Hearth Extension Detail
Fire Risk
• Hearth extensions must be installed
exactly as speci
fi
ed.
High temperatures or hot embers may ignite
concealed combustibles.
WARNING
