Hearth & Home Technologies HUDBAY-FS User Manual

Page  16

10/08

Quadra-Fire  •  Hudson Bay  •  7003-121 Rev. i

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 roofline. The 
galvanized finish is desirable above the roofline, 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 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 rooflines, 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.

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

1-1/2 in. (38mm) LONG
WOOD SCREWS

CEILING JOISTS

ROUND CEILING 
SUPPORT BOX/WALL 
THIMBLE COVER

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 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