Heat & Glo Fireplace EXCLAIM-42T-C - Manual (Page 12)

Heat & Glo • EXCLAIM-42C • 4013-094 Rev I • 10/06 12
E. Construct the Chase
A chase is a vertical boxlike structure built to enclose the ¿ re-
place and/or its vent system. Vertical chimneys that run on
the outside of a building must 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. All outer walls need to be insulated.
Building codes require false ceiling and ceiling ¿ restops at
each À oor of the chase or every 10 ft (3.05 m) of clear space
to control spread of ¿ re.
Walls, ceiling, base plate and cantilever À oor at the ¿ rst level
of the chase should be insulated. See Figure 3.5. Vapor and
air in
¿ ltration barriers should be installed in the chase as per
regional codes for the rest of the home. Additionally, Hearth
& Home Technologies recommends that the inside surfac-
es be sheet rocked and taped (or the use of an equivalent
method) for maximum air tightness.
Ceiling
Firestop
Metal Chase Top
Round Termination Cap
False Ceiling
Insulation in the
outside walls
of the chase
Attic
Insulation
Shield
Chimney
Ceiling
Firestop
Tabs
False Ceiling False Ceiling
Insulation Insulation
Figure 3.5 Chase Assembly
F. Chimney Requirements
When planning your ¿ replace location, the chimney con-
struction and necessary clearances must be considered.
The
¿ replace system and chimney components have been
tested to provide À exibility in construction. Vertical distances
are measured from the base of the ¿ replace as shown in
Figure 5.2.
1 2 3
All outside walls should be insulated.
Figure 3.6 Chase Constructions
1. Fireplace and chimney enclosed in an exterior chase.
2. Chimney offset through exterior wall and enclosed in
chase.
3. Chase constructed on roof.
Gas line holes and other openings should be caulked with
high temperature caulk or stuffed with unfaced
¿ berglass in-
sulation. If the ¿ replace is being installed on a cement slab,
we recommend that in cold climates, a sheet of plywood or
other raised platform be placed underneath to prevent con-
ducting cold up into the room.
Three examples of chase applications are shown in Fig-
ure 3.6.
ft m
• Minimum overall straight height 18 5.5
• Minimum height with offset/return 18.5 5.6
• Maximum height 90 27.4
• Maximum chimney length between an offset and
return
20 6
• Maximum distance between chimney stabilizers 35 10.7
• Double offset/return minimum height 24 7.3
• Maximum unsupported chimney length between the
offset and return
6 1.8
• Maximum straight unsupported chimney height
above the ¿ replace
35 10.7
• Maximum unsupported chimney above roof 6 1.8
Note: A maximum of two pairs of offsets and returns may
be used.
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