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C. Zero Clearance Wall Extension
Surrounds MUST overlap wall extension.
A non-combustible wall extension can be used to cover
an existing masonry surface. Wall extensions are typically
used to improve cosmetics.
WARNING! Risk of Fire! Comply with all minimum clear-
ances to combustibles as specified. Framing or finishing
material closer than the minimums listed must be construct-
ed entirely of noncombustible materials (i.e., steel studs,
concrete board, etc).
Combustible facings must not extend behind the insert
surround. See Figure 1.E and 1.F.
Non-Combustible Materials Specification
Material which will not ignite and burn. Such materials are
those consisting entirely of steel, iron, brick, tile, concrete,
slate, glass or plasters, or any combination thereof.
Materials that are reported as passing ASTM E 136,
Standard Test Method for Behavior of Materials in a
Vertical Tube Furnace at 750 ºC.
WALL EXTENSION
NEW WALL
FACE
Y
FLOOR
X - Minimum - measure from
center of firebox opening.
Y - Minimum - measure from
the bottom of the appliance.
Figure 3.10 Non-Combustible Framing Requirement
Heat & Glo • COSMO-I30-IFT, COSMO-I35-IFT Installation Manual • 2535-980 Rev. V • 10/23
X
Y
UNIT
(min)
(min)
30 in.
33-1/2
56
35 in.
36
60
EXISTING MASONRY WALL
x
C L
Y
FLOOR
X - Minimum - measure from
center of firebox opening.
Y - Minimum - measure from
the bottom of the appliance.
Figure 3.11 Non-Combustible Facing Requirement
WALL EXTENSION
NEW WALL
FACE
FLOOR
NON-COMBUSTIBLE ZONE
Figure 3.12 Non-Combustible Framing / Facing Requirement
• Facing and/or finishing materials must not interfere with
air flow through decorative barrier fronts.
• Facing and/or finishing materials must never overhang
into the glass opening.
• Observe all clearances when applying combustible
materials.
• Maximum depth of wall extension is 12 inches. This
may be limited by the flex pipe's ability to connect to the
starting collar.
• Covering combustible materials with non-combustible
materials does not qualify material as non-combustible.
WARNING! Risk of Fire! DO NOT apply combustible
materials beyond the minimum clearances. Comply with
all minimum clearances to combustibles as specified in
this manual. Overlapping materials could ignite and will
interfere with proper operation of decorative barrier fronts.
X (min)
Y
UNIT
(min)
30 in.
33-1/2
56
35 in.
36
60
C L
x
EXISTING MASONRY WALL
15
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