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A ³⁄₄" marble slab set in ¹⁄₂" mortar covers the
brick, "R" for the marble and mortar becomes:
= 0.09 x ³⁄₄" = .068
"R"
= r x T
M
M
= 0.20 x ¹⁄₂" = .10
"R"
= r x T
M
M
The sum of all "R values" is:
.70 + .10 +. 068 + .10 = .968
This would not be an acceptable combination
of material for the hearth extension since the
total calculated "R value" of the materials used
is under the required "R value" of 1.19. An
additional layer of insulating materials must
be used.
WARNING: THE CRACK BETWEEN THE
FIREPLACE AND THE HEARTH EXTEN-
SION MUST BE SEALED WITH A NON-
COMBUSTIBLE MATERIAL.
WARNING: WHEN INSTALLING THE
HEARTH EXTENSION BE CAREFUL NOT
TO BLOCK THE HEAT-CIRCULATING AIR
INLET GRILL.
WARNING: WHEN INSTALLING HEARTH
EXTENSION IN FRONT OF THE FIRE-
PLACE, THE FIREPLACE MUST BE RAISED
IF HEIGHT OF HEARTH EXTENSION EX-
CEEDS 5 3/4" ABOVE BOTTOM OF FIRE-
PLACE ( FIGURE 46 ).
5-3/4" Max.
(146 mm)
Max. Thickness Of Hearth Extension
When Fireplace Is On The Floor
Figure 46
Secure the hearth extension to the floor to
prevent possible shifting.
FINISH TO YOUR TASTE
There are a wide variety of "finished looks" for
these fireplaces, from formal wall decor with
elaborate mantels to rustic wood paneling or
warm brick facings.
Only noncombustible materials like stone, tile,
brick, etc., may overlap the black front facing.
Do not extend these materials beyond the black
facing and into the firebox area. Be sure not to
interfere with the installation and operation of
glass doors or block the upper or lower grilles.
Seal all joints between the black facing and wall
surrounds to prevent air intrusion. Use non-
combustible caulking material only to seal the
black metal facing to the surround material on
the finished wall.
Combustible materials may project beyond the
sides of the fireplace opening as long as they
are kept within the shaded areas illustrated in
Figure 47 .
Combustible
Materials Allowed
in Shaded Area
45˚
12"
(305 mm)
12"
(305 mm)
Figure 47
INSTALLATION COMPONENTS
The following items are available for use in the
installation of this appliance.
Firestop Spacer (30°)
63L32
Firestop Spacer (Flat)
63L31
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
Chimney Section
Flashing
1" (25 mm)
Combination
Offset/Return Elbow
Thimble Extension 2"
F8FS30-2
Shipping Weight
F8FS-2
63L10
FTF8-12
63L13
FTF8-18
63L14
FTF8-36
63L15
FTF8-48
19M55
F8F6MM
19M56
F8F12MM
63L28
FTF8-OR15
19M52
F8-TE26-2
215 lbs.
17
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