C. Mantel and Wall Projections
A combustible mantel may be positioned no lower than 60
in. (1524 mm) from the base of the fireplace.
Refer to Section 3 for reduced mantel height allowances.
The combustible mantel may have a maximum depth of
12 in. (305mm). Combustible trim pieces that project no
more than 3/4 in. (19 mm) from the face of the fireplace
can be placed no closer than 6 in. (152 mm) from the top
or side of the decorative front. Combustible trim must not
cover:
• the metal surfaces of the fireplace
• where the non-combustible board is placed over the
metal surfaces
• the space between the metal face of the fireplace and
framing members
60 in.
(1524 mm)
Mantel
Clearances are from
bottom of appliance to
lower edge of mantel
or trim
Trim
48 in.
(1219 mm)
36 in. (914 mm)
Ceiling/enclosure
Figure 7.2 Mantel Specifications - Combustible Mantel
D. Finishing the Hearth Extension
Table 7.1
R
= 1/k x inches of thickness
Table 7.2
WARNING! Risk of Fire!
High temperatures, sparks, em-
bers or other burning material falling from the fireplace
may ignite flooring or concealed combustible surfaces.
• Protective metal hearth strips MUST be installed.
• Hearth extensions MUST be installed exactly as
specified.
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.
• You MUST use a hearth extension with this fireplace.
• Refer to Figure 7.4 for minimum dimensions.
• This fireplace has been tested and approved for use with
a hearth extension insulated to a minimum R value of
2.06.
• The hearth extension material MUST be covered with
tile, stone or other non-combustible material.
• Manufactured hearth materials will usually have a
published
R value
(resistance to heat) or
k value
(conductivity of heat). Refer to the formula in Table 7.1
to convert a k value to an R value,
• Refer to Table 7.2 for hearth extension insulation
alternatives.
Hearth Extension Insulation Alternatives, R Value = 2.06
Material
k per inch
thick
r per inch
thick
Minimum
thickness
required
Hearth & Home HX3, HX4
0.49
2.06
1 in.
USG Micore 300™
0.49
2.06
1 in.
USG Durock™ Cement Board
1.92
0.52
4 in.
Cement Mortar
5.0
0.20
10 1/2 in.
Common Brick
5.0
0.20
10 1/2 in.
Ceramic Tile
12.50
0.08
25 3/4in.
Armstrong™ Privacy Guard Plus
0.46
2.18
1 in.
Marble
14.3-20.0
0.07-0.05
29 1/2 - 41 1/4 in.
A noncombustible mantel may be positioned no lower
than 46 in. (1168 mm) from the base of the fireplace.
Noncombustible framing materials must be used above
the fireplace to a height of 84 in. (2134 mm) or to the
ceiling from the base of the fireplace for all construc-
tion materials, framing members, sheeting, and all finish
materials.
Figure 7.2 Mantel Specifications - Non-Combustible Mantel
46 in.
(1168 mm)
Noncombustible
Mantel
Clearances are from
bottom of appliance to
lower edge of mantel
or trim
All construction materials, framing
members, sheeting and finish
materials MUST be noncombustible.
37
Quadra-Fire • 7100 FP • 433-3610 Installation Manual • Rev G • 5/27/14
