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D. Hearth Extension
WARNING! Risk of Fire! Hearth extension required to
protect combustible floors in front of appliance.
WARNING! Risk of Fire! DO NOT block ventilation
slots. A minimum 1/4 in. space between the bottom of
hearth refractory and top of field installed hearth exten-
sion (marble, tile, granite, etc) is required across full width
of fireplace.
If the appliance is to be placed directly on the floor, the
non-combustible hearth material will be limited to 3/4 in.
thick, including the floor adhesive. If the hearth mate-
rial will exceed 3/4 in. thick, the appliance will need to
be shimmed from the floor appropriately to maintain 1/4
in. minimum space between the floor hearth and hearth
refractory.
The base of the fireplace may sit on a combustible sur-
face. The area in front of the fireplace must be protected
by a noncombustible hearth extension, unless the fire-
place is raised a minimum of three inches above the com-
bustible floor or hearth. See Figures 3.5, 3.6 and 3.8.
NON-COMBUSTIBLE
MATERIAL ON SIDES
(PROFILE VIEW)
1/4 INCH SPACE
MARBLE, GRANITE, TILE OR
OTHER NON-COMBUSTIBLE
HEARTH EXTENSION
3/4 IN. MAX
12 IN.
WOOD OR OTHER
COMBUSTIBLE FLOOR
OR PLATFORM
Figure 3.5 Fireplace Positioned on Combustible Surface
MINIMUM
1/4 INCH SPACE
REQUIRED
3-3/4 IN.
WOOD OR OTHER
COMBUSTIBLE
FLOOR OR PLATFORM
Figure 3.6 Fireplace Raised A Minimum of 3 Inches Above
Combustible Surface
12
MINIMUM
REQUIRED
HEARTH
BOTTOM OF
FIREPLACE
REFRACTORY
3 IN.
BOTTOM OF FIREPLACE
MIN.
COMBUSTIBLE MATERIAL
1 IN. MAX THICKNESS
ALLOWED UNDER
FIREPLACE
Heat & Glo • ESC-42ST-IFT Installation Manual • 2464-980 Rev. C • 7/17
23 IN.
3-1/2 IN.
NO COMBUSTIBLES
IN THIS AREA
39 IN.
4 IN.
Figure 3.7 Non-Combustible Zone
A
A
B
in.
60-1/4
12
mm
1530
305
Figure 3.8
Non-Combustible Hearth Extension Minimum
Dimensions (Fireplace Positioned on Combustible
Surface)
1/2 IN. BUILDING MATERIAL
(MAY BE COMBUSTIBLE)
COMBUSTIBLE
FRAMING
FACTORY-SUPPLIED
1/2 IN.
NON-COMBUSTIBLE
BOARD
B
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