Quadra-Fire HUDBAY-FS Installation Manual page 17

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.
FRAMING
Figure 5.13
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.
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.
17
CEILING JOISTS
ROUND CEILING
SUPPORT BOX/WALL
THIMBLE COVER
1-1/2 in. (38mm) LONG
WOOD SCREWS
Quadra-Fire • Hudson Bay Installation Manual_R26 • 01/20
SHINGLES OVERLAP ON
TOP EDGE OF FLASHING
CAP AND STORM COLLAR NOT SHOWN FOR CLARITY
Figure 5.14
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). 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.
OPTIONAL HIGH WIND
TERMINATION CAP
SECURE FLASHING WITH
NON-HARDENING SEALANT
AND ROOFING NAILS
Figure 5.15
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