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CATHEDRAL CEILINGS
Round Support (RDS) &
Square Support (SQS)
If your home has a cathedral ceiling (no attic
space between the ceiling and the roof), install
the chimney and support as follows.
nails
Ceiling Firestop
32mm
Min.
32mm Min.
32mm Min.
32mm Min.
Diagram 13
Offset Chart
GS 152mm Nominal Diameter ID
Offset
Pipe Length (L)
mm
mm
121
0
229
152
286
229
337
305
552
610
768
914
965
1219
L
Offset
1. Situate the chimney in a convenient location
as near as possible to the appliance outlet.
Cut and frame a hole in the roof for the sup-
port. The sides of this hole must be vertical
with 32mm clearance.
FG39-2 Freestanding Gas Stove
2. Place the support in the opening. Lower it
to the correct height as determined by the
table and diagram below.
Using a level, make sure the support is
vertical. If the support extends above the
roof, cut it flush with the top of the roof. Nail
the support to the frame opening using (8)
76mm spiral nails or #8 x 38mm screws.
Note: If you are using a 152mm square
support you may find it difficult to
screw it in place because it is fairly
small inside.
Simpson Dura-Flue has provided angle
brackets with this support which can be
screwed to the outside of the support box
and nailed to surrounding framing as re-
quired. Use a minimum of four #8 x 13mm
screws per bracket. In some cases these
Slope
0/12 - 2/12
2/12 - 7/12
7/12 - 12/12
12/12 - 24/12
24/12+
Height
mm
337
445
495
552
768
991
1194
brackets may need to be trimmed (e.g.: to
fit under a flashing). Place the Finish Col-
lar around the support and fasten it to the
ceiling using the screws provided.
3. Use appropriate roof flashing. Place the
flashing under the upper shingles and on
top of the lower shingles approximately half
of the flashing should be under the shingles.
4. Assemble the desired lengths of Black Pipe
and Elbows necessary to reach from the
appliance adaptor up through the support
box and flashing to proper height as per
Dia. 12, local codes or page 9. Ensure that
all pipe and elbow connections are in their
fully twist lock position.
5. Ensure flue is vertical and secure flashing to
6. Twist lock the flue cap on to the last section.
Support Extensions - Round
(RDSE) or Square (SQSE)
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 559mm.
The extension is attached to the support using
the eight metal screws provided. Be sure there
is at least a 51mm overlap where the extension
joins the support.
"X"
102mm
140mm
172mm
191mm
378mm
installation
the roof with roofing nails. Slide the storm
collar over the pipe section and seal with a
mastic.
21
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