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4
INTERIOR INSTALLATION CATHEDRAL CEILING
REDUCED CLEARANCE SUPPORT (RCS)
NOTE: The Reduced Clearance Support (RCS)
comes with a collar. It can be discard-
ed for a Cathedral Ceiling application, it
is not required.
Step 1: Locate the chimney in a conve-
nient location as near as possible
to the appliance outlet. Cut and
frame an opening in the roof for the
support (see Table 5). The sides of this hole
must be vertical (see Figure 11).
Step 2: From above, place the support in the open-
ing.
NOTE: The bottom portion of the support must ex-
tend below the ceiling. Distance will vary accord-
ing to pitch (see Table 6). The minimum horizontal
distance between the single wall stove pipe and
the vertical surface is 18".
Step 3: Use a level to ensure the support is verti-
cal. If the support extends above the roof,
cut it flush with the top of the roof. Attach the
support to the framed opening using (12)-3"
spiral nails or #8 x 1 1/2" wood screws (see
Figure 10).
Step 4: Place first chimney length into the support.
Twist to lock into place. Wrap the insulation
pad around the chimney section removing
any excess. Slide insulation pad into the
space between the chimney section and
support making sure the insulation makes
contact with the bottom of the support.
Additional pieces of insulation can be loosely
tucked down within corners. Do not com-
press insulation. This reduces effectiveness.
Where desired, an extension (SE) is avail-
able for the support. This may be needed
in steeper cathedral applications. Approved
insulation can be used within the extension.
It must be listed/compliant with ASTM E136/
ULC S114 as non-combustible, have a
melting temperature above 2000°F/1100°C,
and be water resistant with low moisture
10
RCS
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
absorption.Materials such as rockwool or
mineral wool qualify.
IMPORTANT: Approval to include additional
insulation around the chimney applies
only within the (RCS) and (SE) support ex-
tension. 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 STEP 6 ON PAGE 15.
FLASHING
(12) 3" lg. SPIRAL NAILS or
1 1/2" WOOD SCREWS
INSULATION
Figure 10
HOLE SIZE
DOWN
SIDES OF HOLE MUST
ACROSS
BE VERTICAL
SLOPE
Figure 11
6"
Chimney
Hole Size (Reduce Clearance Support)
Size
Roof
A
B
Slope
x/12
0
10-1/8
10-1/8
11-1/8
2/12
10-1/8
10-1/4
11-1/8
4/12
10-1/8
10-5/8
11-1/8
6/12
10-1/8
11-1/4
11-1/8
8/12
10-1/8
12-1/8
11-1/8
10/12
10-1/8
13-1/4
11-1/8
12/12
10-1/8
14-1/4
11-1/8
Table5
NOTE: ALL DIMENSIONS ARE IN INCHES.
RAIN CAP (CC)
SILICONE
CAULKING
STORM COLLAR
ROOF JOIST
REFER TO TABLE 6
"X" MIN
SUPPORT (RCS)
ROOF SLOPE
INCHES
12 IN
B
X
A
7"
8"
A
B
A
B
11-1/8
12-1/8
12-1/8
11-1/4
12-1/8
12-1/4
11-3/4
12-1/8
12-3/4
12-1/2
12-1/8
13-1/2
13-1/4
12-1/8
14-1/2
14-1/2
12-1/8
15-7/8
15-3/4
12-1/8
17-1/8
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