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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 enclosed inside the chase.
NOTICE: Treatment of ceiling fi restops and wall shield
fi restops 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.
B
D
A
Rough
Opening
(Vent Pipe)
Millimeters
220
Figure 5.2. Clearances to Combustibles
A
C
MINIMUM FRAMING DIMENSIONS*
B
C
D
Rough
Rough
Rough
Opening
Opening
Opening
(Height)
(Depth)
(Width)
1070
460
1270
Heat & Glo • XLR-N-AU, XLR-PB-AU • 2198-906 Rev. C • 3/10
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 specifi ed 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 fi replace or chimney.
• Failure to maintain airspace may cause overheating and
a fi re.
Note: Figure 5.2 shows the fi replace installed on the
fl oor. However, this fi replace can be elevated off the fl oor
provided that the fi replace is properly supported by framing
materials and the ceiling clearances are maintained.
F
J
E
F
Clearance
Combustible
Combustible
to Ceiling
Floor
Flooring
790
0
MEASURE FROM TOP
OF FIREPLACE OPENING
G
I
G
H
I
Behind
Sides of
Appliance
Appliance
0
30
30
E
H
J
Front of
Appliance
91
19
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