Hearth Extension - Outdoor Lifestyles ODFORTG-36 Installation Manual

E. 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 in. SPACE
REQUIRED
MARBLE, GRANITE, TILE OR
OTHER NON-COMBUSTIBLE

HEARTH EXTENSION

3/4 in. MAX
8 in.
WOOD OR OTHER
COMBUSTIBLE FLOOR
OR PLATFORM
Figure 3.5 Fireplace Positioned on Combustible Surface
Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev B • 8/17
MINIMUM
BOTTOM OF
HEARTH
FIREPLACE
REFRACTORY
17 in.
(432 mm)
27-3/4 in.
(705 mm)
24 in.
(610 mm)
NOTE: No combustibles in this area between the
two walls.
Figure 3.6 Non-Combustible Zone
3-1/2 in.
(89 mm)
6 in.
(152 mm)
66-1/4 in.
(1683 mm)
11