9
GCUF/GRUF Vent-Free Fireboxes
Monessen • GCUF/GRUF Owner Manual • 71D0530 • Rev G • 01/20
FP2688
min floor combustible
5" Minimum
Combustible
Material
FP2688
Figure 7 -
Minimum Clearance Above
Combustible Flooring
MINIMUM CLEARANCES and FRAMING
14” Minimum
FP2689
min floor clear noncomb
Can be Less
Than 5"
Noncombustible
Material
FP2689
Figure 8 -
Minimum Clearance above Combustible Flooring with
Noncombustible Material Installed at Base of Fireplace
FIREBOX FRAMING
Firebox framing can be built before or after the appliance
is set in place. Construct firebox framing following
Figure
1
for your specific installation requirements.
See Figure 1
on Page 6
for firebox dimensions. The framing headers
may rest on the top of the firebox.
The firebox may be installed directly on a combustible floor
or raised on a platform of an appropriate height. When
the firebox is installed directly on carpeting, tile, or other
combustible material, other than wood flooring, the firebox
shall be installed on a metal or wood panel extending the
full width and depth of the enclosure.
The classification "noncombustible material" includes, but
is not limited to: stone, brick, and mortar. Noncombustibles
are safe to overlay the black-painted metal face, including
radiant plates, and do not pose a fire hazard. Any noncom
-
bustible finish material must not extend past or interfere
with the fireplace opening.
The classification "combustible material" includes, but is
not limited to: plywood, drywall, and particle board. Com-
bustible materials may contact the sides, bottom, or back
of the firebox. Do not overlay the black painted face with
combustible materials.
WARNING!
Do not fill spaces around firebox with insulation
or other materials. This could cause a fire.
WARNING!
The fireplace must be installed giving full
consideration to the clearance and height
requirements identified in this manual.
5. Floor clearance:
This inner chamber firebox floor must
be installed at least 5" above any combustible flooring
material, such as carpeting or asphalt tile, which is
closer than 14" to the base of the firebox.
Figure 7
OR
The inner chamber firebox floor may be installed nearer to
the floor if a minimum of 14" of noncombustible material
such as slate or marble is installed between the base of
the firebox and the combustible flooring.
Figure 8
