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4
INTERIOR INSTALLATION WITH CATHEDRAL CEILING (CONT'D)
* CLEARANCE
18 " MIN.
be added to the support, and box exten-
HORIZONTAL
sion. Approved insulation must be listed /
compliant with ASTM E136/ULC S114 as
CAN BE REDUCED IF A LISTED STOVE PIPE IS USED
Non-Combustible, have a melting tempera-
ture above 2000°F/1100°C, and be water
resistant with low moisture absorption.
Materials such as rockwool or mineral wool
qualify.
Approval to include additional insulation around the chim-
ney applies only within the Reduced Clearance Support
FLASHING
and Square Support. DO NOT attempt to field-insulate
around the pipe at any other location or within any other
uninsulated component offered by DuraVent.
TO CONTINUE INSTALLATION
REFER TO FLASHING INSTALLATION ON PAGE 6.
(12) - 3" lg.
SPIRAL
NAILS
2" OVERLAP
Figure 12
(XFC+)
(12) 3" SPIRAL
NAILS
CATHEDRAL
SUPPORT(XSCC)
Figure 8
RAIN CAP (CC+)
WARNING
SILICONE
CAULKING
STORM COLLAR
+
(XFC
)
ROOF
JOIST
SQUARE
CATHEDRAL
SUPPORT (XSSC)
EXTENSION
8 METAL SCREWS
SUPPORT (SS)
SUPPORT EXTENSION (CSE24)
REDUCE CLEARANCE SUPPORT EXTENSION (SE)
Steep pitched cathedral ceilings may require the
use of a Support Extension. This piece fits down
inside the Support and can be adjusted to increase
the support's length by up to 22".
The extension is attached to the support using the
eight metal screws provided. Be sure there is at
least a 2" overlap where the extension joins the
support. See Figure 12
FINISH TRIM
X min
SQUARE
SUPPORT
MINIMUM SUPPORT EXTENSION
BELOW CEILING
Slope
0/12 - 2/12
2/12 - 7/12
7/12 - 12/12
12/12 - 24/12
24/12
Table 6
FLUE
EXTENSION
X
3 1/2"
5 1/2"
6 3/4"
7 1/2"
12 1/12"
11
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