Assemble The Chimney Sections; Install The Firestop Spacers - Heatilator ST42A Owner's Manual

C. Assemble the Chimney Sections
Attach either a straight chimney section or an offset to the
top of the fi replace (depending on your installation require-
ment). Chimney sections are locked together by pushing
downward until the top section meets the stop bead on the
lower section.
The inner fl ue is placed to the inside of the fl ue section below
it. The outer casing is placed outside the outer casing of the
chimney section below it. See Figure 5.4.
Figure 5.4 Assembling Chimney Sections
Note: Inner fl ue and outer liner sections cannot be disas-
sembled once locked together. Plan ahead to ensure the
proper installation height is achieved with the selected
chimney components.
WARNING
Fire Risk
Do NOT install substitute or damaged
chimney components.
• MUST use chimney system described in
this manual.
• NO OTHER chimney components may
be used.
Substitute or damaged chimney components
may impair safe operation.
D. Install the Firestop Spacers
• Mark and cut an opening in the ceiling for the spacer being
used. See Figure 5.5.
• Frame the opening with the same size lumber used in the
ceiling joists.
• Install the fi restop spacer.
18
Note: The fi restop spacer MUST be nailed to the bottom
of the ceiling joists EXCEPT when the space above is
uninsulated and the attic insulation shield is not being used
(see Figure 5.5). When the attic insulation shield is used
the spacer may be above or below the joist of an insulated
ceiling.
Figure 5.5
Note: You must provide support for the pipe during con-
struction and check to be sure inadvertent loading has not
dislodged the chimney section from the fi replace or at any
chimney joint.
•
•
•
Firestop slows spread of fire and reduces cold air
infi ltration.
Heatilator • ST42A • 35038 Rev G • 02/05
ROOM ABOVE (non-insulated ceiling)
B
Spacer from
bottom
ATTIC ABOVE (insulated ceiling)
Spacer from
top
Note:
Use same dimensional lumber for framing
spacer and joists.
A
Catalog # in.
FS538 17
FS540 17
Installing the Firestop Spacer
CAUTION
Firestop spacers must be used at ceiling/fl oor.
Chase construction requires fi restops at each fl oor or
every 10 ft (3.05 m) of clear space.
Use same dimensional lumber as joists.
A
When attic insulation
shield not used
B
mm in. mm
432 17 432
432 26 660