Construct The Chase; Chimney Requirements - Heatilator CI60 Owner's Manual

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 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 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.
Round Termination Cap
Metal Chase Top
Ceiling
Firestop
False Ceiling
Attic
Insulation
Tabs
Shield
Ceiling
Firestop
Insulation Insulation
False Ceiling
False Ceiling
Chimney
Figure 3.5 Chase Assembly
12
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
F. Chimney Requirements
When planning your replace location, the chimney construc-
tion and necessary clearances must be considered. The re-
place system and chimney components have been tested to
provide exibility in construction. The following gures are
the minimum distances from the base of the replace.
• Minimum overall straight height
• Minimum height with offset/return
• Maximum height
• Maximum chimney length between an offset and
Insulation in the
outside walls
of the chase
• Maximum distance between chimney stabilizers
• Double offset/return minimum height
• Maximum unsupported chimney length between the
• Maximum straight unsupported chimney height above
• Maximum unsupported chimney above roof
Note: A maximum of two pairs of offsets and returns may
be used.
Heatilator • CI60 • 4013-031 Rev M • 10/06
1. Fireplace and chimney enclosed in an exterior chase.
2. Chimney offset through exterior wall and enclosed in
chase.
3. Chase constructed on roof.
All outside walls should be insulated.
1
Figure 3.6 Chase Constructions
return
offset and return
the replace
2
ft
18
18.5
90
20
35
24
6
35
6
3
m
5.5
5.6
27.4
6
10.7
7.3
1.8
10.7
1.8