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Heatilator • Caliber Multi-Sided Direct Vent • 4002-079 Rev K • 11/07
9
B. Construct the Appliance Chase
A chase is a vertical boxlike structure built to enclose the gas
appliance and/or its vent system. Vertical vents that run on
the outside of a building may be, but are not required to be,
installed inside a chase.
Construction of the chase may vary with the type of build-
ing. These instructions are not substitutes for the require-
ments of local building codes. Local building codes MUST
be checked.
Chases should be constructed in the manner of all outside
walls of the home to prevent cold air drafting problems. The
chase should not break the outside building envelope in any
manner.
Walls, ceiling, base plate and cantilever
À
oor of the chase
should be insulated. Vapor and air in
¿
ltration barriers should
be installed in the chase as per regional codes for the rest
of the home. Additionally, in regions where cold air in
¿
ltar-
tion may be an issue, the inside surfaces be sheetrocked
and taped (or use of an equivalent method) for maximum air
tightness.
To further prevent drafts, the ceiling
¿
restops should be
caulked with high temperature caulk to seal gaps. Gas line
holes and other openings should be caulked with high tem-
perature caulk or stuffed with unfaced insulation. If the appli-
ance is being installed on a cement slab, a layer of plywood
be placed underneath to prevent conducting cold up into the
room.
Fire Risk
Odor Risk
• Install appliance on hard metal or wood
surfaces extending full width and depth
of appliance.
• Do NOT install appliance directly on
carpeting, vinyl, tile or any combustible
material other than wood.
WARNING
Fire Risk
• Construct chase to all clearance
speci
¿
cations in manual.
• Locate and install appliance to all
clearance speci
¿
cations in manual.
WARNING
Measured from top of hood (in inches)
1-11
12
13
14
15
16
17
18
4-3/4
5-1/2
6-1/4
7
7-3/4
8-1/2
9-1/4
10
34-3/8 in. minimum
to ceiling
Figure 3.2 Clearances to Mantels or Other Combustibles Above
Appliance
0 in. min.
to perpendicular wall
A
2 in. (51 mm) min.
from fireplace opening
to perpendicular wall
B
48 in.
(1219 mm)
max.
Mantel Leg or
Perpendicular Wall
Top of
Appliance
Drywall
A
B
Figure 3.3 Clearances to Mantel Legs or Wall Projections (Accept-
able on both sides of opening)
C. Mantel Projections
Fire Risk
• Comply with all minimum clearances to
combustibles as speci
¿
ed.
WARNING
• Framing or
¿
nishing material used on the front of, or
in front of, the appliance closer than the minimums
listed, must be constructed entirely of noncombustible
materials (i.e., steel studs, concrete board, etc.).
Failure to comply may cause
¿
re.
¨