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Figure 8.4 Assembling Chimney Sections
ROOM ABOVE (non-insulated ceiling)
ATTIC ABOVE (insulated ceiling)
B
A
Ceilng firestop from
bottom
Ceiling firestop from
top
Note:
Use same dimensional lumber for framing
ceiling firestop and joists.
Figure 8.5 Installing the Ceiling Firestop
• Support the pipe during construction and check to be
sure inadvertent loading has not dislodged the chimney
section from the fi replace or at any chimney joint.
• Attach a straight chimney section or an offset to the top
of the fi replace.
• Place inner fl ue to the inside of the chimney section below
it. Place the outer casing outside the outer casing of the
chimney section below it. Refer to Figure 8.4.
NOTICE: Chimney sections cannot be disassembled
once locked together. Plan ahead!
• Lock chimney sections and/or offsets/returns together by
pushing downward until the top section meets the stop
bead on the lower section.
• Pull on the top section to make sure it is fully engaged
and will not separate.
• You may use #6 or #8 sheet metal screws no longer than
1/2 in. (13 mm) to fasten chimney sections together. Do
not penetrate inner fl ue.
WARNING! Risk of Fire! You MUST use screws (pro-
vided) to fasten offset/returns to chimney sections to
keep the chimney parts from twisting. Failure to do so
could cause fi re.
• Fasten offset/returns to chimney sections. Insert the
screws (provided) through the predrilled holes. Do not
penetrate inner fl ue.
• Secure chimney returns with hanger straps provided;
fasten to studs or joists.
• Vertical straight runs of chimney must be supported every
35 ft (10.7 m).
C. Assembling Chimney Sections
WARNING! Risk of Fire! DO NOT install substitute or
damaged chimney components.
• Use only those components described in this manual.
Substitute or damaged chimney components could impair
safe operation and cause overheating and fi re.
D. Install Chimney Air Kit
• Required in Canada.
• Follow instructions provided with this accessory.
• Install a ceiling fi restop whenever chimney penetrates
ceiling/fl oor.
• Mark and cut an opening in ceiling as shown in
Figure 8.5.
• Frame the opening with the same size lumber used in
the ceiling joists.
• Nail the ceiling fi restop to the bottom of the ceiling joists
when there is a room above.
• Use an attic insulation shield if the ceiling is insulated.
The ceiling fi restop may then be attached above or below
the joists.
E. Installing Ceiling Firestops
CAUTION! Risk of Fire! Ceiling fi restops must be used
whenever the chimney penetrates a ceiling/fl oor.
• Chase construction requires ceiling fi restops at
each fl oor or every 10 ft (3.05 m) of clear space.
• The ceiling fi restop slows spread of fi re and reduc-
es cold air infi ltration.
WARNING! Risk of Fire! DO NOT seal area between
fi restop opening and chimney pipe. Restricting air fl ow
around chimney may cause fi re.
Heatilator • A36C & A42C • 28396 • Rev AG • 11/08
Catalog #
AB
Anglein. mm in. mm
FS338 14-1/2 368 14-1/2 368 0°
FS339 14-1/2 368 18-3/8 467 15°
FS340 14-1/2 368 23 584 30°