Hearth and Home Technologies Direct Vent Gas Appliance COLBAY-FS-B - Manual (Page 16)

Page 16 10/08 Quadra-Fire • Columbia Bay • 250-5195 Rev. K
PLUMBER'S TAPE
CONNECTED TO
WALL STRAP
WALL
STRAP
TWO 45 DEGREE
ELBOWS
Step 2.
S
et the gas appliance in its desired location. Drop a plumb
bob down from the ceiling to the position of the appliance
flue exit, and mark the location where the vent will penetrate
the ceiling. Drill a small hole at this point. Next, drop a plumb
bob from the roof to the hole previously drilled in the ceiling,
and mark the spot where the vent will penetrate the roof.
Determine if ceiling joists, roof rafters, or other framing will
obstruct the venting system. You may wish to relocate the
appliance, or to offset, as shown in
Figure 5.13 to avoid
cutting load bearing members. When location is determined,
drill small hole.
Figure 5.13
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 5.14.
FRAMING
1-1/2 in. (38mm) LONG
WOOD SCREWS
CEILING JOISTS
ROUND CEILING
SUPPORT BOX/WALL
THIMBLE COVER
Figure 5.14
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.
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 5.13.
(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.
SHINGLES OVERLAP ON
TOP EDGE OF FLASHING
CAP AND STORM COLLAR NOT SHOWN FOR CLARITY
Figure 5.15
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 5.15. Verify that the
chimney is the required height above the roof (see roof pitch
table,
Figure 4.3 on page 8).
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.