Constructing The Appliance Chase; Hearth Extension - Heat & Glo TRUE-36G-IFT Installation Manual

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 昀椀restops and wall shield
昀椀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.
NOTICE: Where required by code, install only sprinkler
heads with a sprinkler activation temperature classi昀椀ed
as Extra High.
• Sprinklers inside of chase: Keep sprinkler head away
from vent and chimney.
• Heat Management applications: Maintain 36 inches of
clearance to openings from which heat is discharged
such as heat zone registers, etc.
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 昀椀restops 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 stu昀昀ed with unfaced insulation. 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.
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 speci昀椀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 昀椀replace or chimney.
• Failure to maintain airspace may cause overheating and
a 昀椀re.
Heat & Glo • TRUE-36-IFT, TRUE-42-IFT, TRUE-50-IFT Installation Manual • 2461-980 Rev. Y • 6/23
D. Hearth Extension
WARNING! Risk of Fire! Non-combustible hearth exten-
sion may be required when appliance is installed on com-
bustible surface.
• Hearth extension must be non-combustible and
serves to protect combustible 昀氀oors in front of appli-
ance. See Figure 3.10 and Figure 3.11.
The base of the 昀椀replace may sit on a combustible
•
surface. See Figure 3.11. The area in front of the
appliance must be protected by a non-combustible
hearth extension, unless the appliance is raised a
minimum of three inches above the combustible 昀氀oor
or hearth. See Figure 3.11 and Figure 3.12.
If a hearth greater than one inch in thickness is de-
•
sired, the appliance must be raised by the equivalent
height to ensure that the hearth extension does not
interfere with the installation of the glass assembly
required for 昀椀replace operation. See Figure 3.11.
A
MODEL
in.
TRUE-36-IFT
12
TRUE-42-IFT
12
TRUE-50-IFT
12
Figure 3.10 Non-Combustible Hearth Extension Dimensions
B
A B
in.
mm mm
57-1/4
305 1454
63-5/16
305 1608
71-5/16
305 1811
17