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B. Constructing the Appliance Chase
A chase is a vertical box-like structure built to enclose the
gas appliance and/or its vent system. In cooler climates
the vent should be enclosed inside the chase.
NOTICE: Treatment of ceiling firestops and wall shield
firestops and construction of the chase may vary with the
type of building. These instructions are not substitutes
for the requirements of local building codes. Therefore,
you MUST check local building codes to determine the
requirements to these steps.
Chases should be constructed in the manner of all out-
side walls of the home to prevent cold air drafting prob-
lems. The chase should not break the outside building
envelope in any manner.
Walls, ceiling, base plate and cantilever floor of the chase
should be insulated. Vapor and air infiltration barriers
should be installed in the chase as per regional codes for
the rest of the home. Additionally, in regions where cold
air infiltration may be an issue, the inside surfaces may be
sheetrocked and taped for maximum air tightness.
NOTICE: Measure fireplace dimensions and verify
framing methods and wall covering details, before framing
construction begins.
To further prevent drafts, the wall shield and ceiling fire-
stops should be caulked with high temperature caulk
(150 °C minimum continuous exposure rating) to seal
gaps. Gas line holes and other openings should be
caulked with high temperature caulk (150 °C minimum
continuous exposure rating) or stuffed with unfaced in-
sulation. If the appliance is being installed on a cement
surface, a layer of plywood may be placed underneath to
prevent conducting cold up into the room.
C. Clearances
NOTICE: Install appliance on hard metal or wood surfaces
extending full width and depth. DO NOT install directly
on carpeting, vinyl, tile or any combustible material other
than wood.
WARNING! Risk of Fire! Maintain specified air space
clearances to appliance and vent pipe:
• Insulation and other materials must be secured to prevent
accidental contact.
• The chase must be properly blocked to prevent blown
insulation or other combustibles from entering and
making contact with fireplace or chimney.
• Failure to maintain airspace could cause overheating
and a fire.
Heat & Glo • 350TSI-P-CEM • 2033-973 Rev. G • 4/17
Clearance to heat shield
The top and back of fireplace are defined by standoffs.
The minimum clearance to a perpendicular wall extending
past the face of the fireplace is 2,5 cm.
The back of the fireplaces may be recessed into combus-
tible construction.
Note: Not intended for fireplace insert.
In planning the installation for the fireplace it is necessary
to determine where the unit is to be installed, the type of
flue system to be used (straight out, corner, or elevated),
and whether optional accessories (wall switch or remote
control) are desired. Gas supply piping should also be
planned. Refer to the appliance data plate on the base
pan of the fireplace for all gas pressures and input rate
information.
The fireplace can be mounted on any of the following
surface:
1. A flat surface (minimum 6 mm base).
2. Four (4) corner supports.
(Example: Four (4) concrete masonry blocks). These
supports must be positioned so they contact all four (4)
perimeter edges on the bottom of the unit.
Fireplace framing can be built before or after the fireplace is
set in place. Framing should be positioned to accommodate
wall covering and fireplace facing material. The fireplace
framing should be constructed of 2 in. X 4 in. (5,1 x 10,2
cm) lumber or heavier. Refer to Figure 5.1 and Figure 5.2
for fireplace and framing reference dimensions.
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