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B
D
A
Rough
Opening
(Vent Pipe)
Inches
10
Millime-
254
ters
* Adjust framing dimensions for interior sheathing (such as sheetrock)
** Fireplace may need to be elevated from the floor affecting framing height B, depending on hearth construction. See Section 3.D
for hearth and combustible floor requirements.
Figure 3.4 Clearances to Combustibles
C. 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 and insulated in the same
manner as the thermal envelope of the home based on
the code requirements for that climate zone to prevent air
leakage and draft problems. The chase is an extension of
the building thermal envelope.
To further prevent drafts and air leakage, the wall shield
and ceiling firestops should be caulked with caulk with
a minimum of 300 ºF continuous exposure rating to
seal gaps. Gas line holes and other openings should
be caulked with caulk with a minimum of 300 ºF continu-
ous exposure rating or stuffed with unfaced insulation. If the
appliance is being installed on a cement surface, a layer of
A
C
MINIMUM FRAMING DIMENSIONS*
B**
C*
D
Rough
Rough
Rough
Opening
Opening
Opening
(Height)
(Depth)
(Width)
46-1/2
30
60-1/4
1181
762
1530
Heat & Glo • ESC-42ST-IFT Installation Manual • 2464-980 Rev. C • 7/17
E=43 IN.
E
Clearance
Clearance
to ceiling
to ceiling
from top of
from opening
appliance
43
33
1092
838
plywood may be placed underneath to prevent conducting
cold up into the room.
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 may cause overheating and
a fire.
E=33 IN.
G
I
F**
G**
Combustible
Combustible
Floor
Flooring
0
See Note Below
0
See Note Below
H
H
I
Sides of
Front of
Appliance
Appliance
1
36
25
914
11
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