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Heat & Glo • COSMO-I30-IFT, COSMO-I35-IFT Installation Manual • 2535-980 Rev. S • 12/21
C. Zero Clearance Wall Extension
Figure 3.11
Non-Combustible Facing Requirement
Figure 3.10
Non-Combustible Framing Requirement
FLOOR
EXISTING MASONRY WALL
NEW WALL
FACE
WALL EXTENSION
NON-COMBUSTIBLE ZONE
Figure 3.12 Non-Combustible Framing / Facing Requirement
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.
• 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.
FLOOR
x
Y
NON-COMBUSTIBLE ZONE
CL
EXISTING MASONRY WALL
NEW WALL
FACE
WALL EXTENSION
FLOOR
x
Y
NON-COMBUSTIBLE ZONE
CL
UNIT X (min)
Y
(min)
30 in. 33-1/2
56
35 in.
36
60
UNIT
X
(min)
Y
(min)
30 in. 33-1/2
56
35 in.
36
60
12 in. max.
DEPTH
A non-combustible wall extension can be used to cover
an existing masonry surface. Wall extensions are typically
used to improve cosmetics.
Surrounds MUST overlap wall extension.
X - Minimum - measure from
center of firebox opening.
Y - Minimum - measure from
the bottom of the appliance.
X - Minimum - measure from
center of firebox opening.
Y - Minimum - measure from
the bottom of the appliance.
