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Heat & Glo • ESC-42ST • 2146-900 Rev. o • 5/1222
E. Hearth Extension
WARNING! Risk of Fire! Hearth extension required to
protect combustible fl oors 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 fi eld installed hearth exten-
sion (marble, tile, granite, etc) is required across full width
of fi replace.
If the appliance is to be placed directly on the fl oor, the
non-combustible hearth material will be limited to 3/4 in.
thick, including the fl oor adhesive. If the hearth mate-
rial will exceed 3/4 in. thick, the appliance will need to
be shimmed from the fl oor appropriately to maintain 1/4
in. minimum space between the fl oor hearth and hearth
refractory.
The base of the fi replace may sit on a combustible surface.
The area in front of the fi replace must be protected by a
noncombustible hearth extension, unless the fi replace is
raised a minimum of three inches above the combustible
fl oor or hearth. See Figures 5.7, 5.8 and 5.10.
Figure 5.9 Non-Combustible Zone
Figure 5.10 Non-Combustible Hearth Extension Minimum
Dimensions (Fireplace Positioned on Combustible
Surface)
AB
in. 60-1/4 12
mm 1530 305
Figure 5.7 Fireplace Positioned on Combustible Surface
WOOD OR OTHER
COMBUSTIBLE
FLOOR OR PLATFORM
3-3/4 IN.
COMBUSTIBLE MATERIAL
1 IN. MAX THICKNESS
ALLOWED UNDER
FIREPLACE
BOTTOM OF FIREPLACE
3 IN.
MIN.
MINIMUM
1/4 INCH SPACE
REQUIRED
Figure 5.8 Fireplace Raised A Minimum of 3 Inches Above
Combustible Surface
3-1/2 IN.
NO COMBUSTIBLES
IN THIS AREA
1/2 IN. BUILDING MATERIAL
(MAY BE COMBUSTIBLE)
COMBUSTIBLE
FRAMING
4 IN.
FACTORY-
SUPPLIED 1/2 IN.
NON-
COMBUSTIBLE
BOARD
39 IN.
23 IN.
A
B
WOOD OR OTHER
COMBUSTIBLE FLOOR
OR PLATFORM
MARBLE, GRANITE, TILE OR
OTHER NON-COMBUSTIBLE
HEARTH EXTENSION
3/4 IN. MAX
12 IN.
HEARTH
REFRACTORY
BOTTOM OF
FIREPLACE
NON-COMBUSTIBLE
MATERIAL ON SIDES
(PROFILE VIEW)
MINIMUM
1/4 INCH SPACE
REQUIRED