Page 16
Quadra-Fire • Hudson Bay • 7003-121_R20 • 11/14
Step 4.
Assemble the desired lengths of pipe and elbows necessary
to reach from the appliance up through the round support
box. Ensure that all pipe and elbow connections are in their
fully twist-locked position. Assemble as instructed.
Step 5.
Cut a hole in the roof centered on the small drill hole
placed in the roof in Step 2. The hole should be of sufficient
size to meet the minimum requirements for clearance to
combustibles, as specified. Continue to assemble lengths of
pipe and elbows necessary to reach from the ceiling support
box/wall thimble up through the roof line. Galvanized pipe
and elbows may be utilized in the attic, as well as above the
roof line. The galvanized finish is desirable above the roof
line, due to its higher corrosion resistance.
NOTE:
1. If an offset is necessary in the attic to avoid obstructions,
it is important to support the vent pipe every 3 ft.
(914mm) to avoid excessive stress on the elbows, and
possible separation. Wall straps are available for this
purpose
, Figure 5.12
, on page 15.
2. Whenever possible, use 45° elbows, instead of 90°
elbows. The 45° elbow offers less restriction to the flow
of flue gases and intake air.
Step 6.
Slip the flashing over the pipe section(s) protruding through
the roof. Secure the base of the flashing to the roof with
roofing nails. Ensure the roofing material overlaps the top
edge of the flashing as shown in
Figure 5.14
. Verify that
the chimney is the required height above the roof. See roof
pitch table,
Figure 4.3
on page 8.
Step 7.
Continue to assemble pipe sections until the height of the
vent (before adding the termination cap) meets the minimum
code requirements as outlined in the current CAN/CGA-
B149 Installation Codes (in Canada), the National Fuel
Gas Code NFPA 54/ANSI Z223.1 (in USA), or local codes.
Note that for steep roof pitches, the vent height must be
increased. See Roof Pitch Table (
Figure 4.3
, on page 8).
In high wind conditions, nearby trees adjoining roof lines,
steep pitched roofs, and other similar factors can result in
poor draft, or down drafting. In these cases increasing the
vent height or switching to the high wind termination cap
may solve this problem.
Step 8.
Slip the storm collar over the pipe, and push it down to
the top of the flashing (
Figure 5.15
). Use non-hardening
sealant above and below the joint between the storm collar
and the pipe.
Step 3.
To install the round support box/wall thimble cover in a flat
ceiling, cut a 10 in. (254mm) square hole in the ceiling,
centered on the hole drilled in Step 2. Frame the hole as
shown in
Figure 5.13
.
SHINGLES OVERLAP ON
TOP EDGE OF FLASHING
CAP AND STORM COLLAR NOT SHOWN FOR CLARITY
Figure 5.14
OPTIONAL HIGH WIND
TERMINATION CAP
SECURE FLASHING WITH
NON-HARDENING SEALANT
AND ROOFING NAILS
Figure 5.15
FRAMING
1-1/2 in. (38mm) LONG
WOOD SCREWS
CEILING JOISTS
ROUND CEILING
SUPPORT BOX/WALL
THIMBLE COVER
Figure 5.13
