Heat & Glo • PALOMA-BZ-MOD, PALOMA-GR-MOD, PALOMA-GY-MOD • 2189-900 R14 • 11/14
17
4. Asse
mble 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.
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.
• If an offset is necessary in the attic to avoid obstructions,
it is important to support the vent pipe every 3 ft. (914
mm) to avoid excessive stress on the elbows, and
possible separation.
Wall straps are available for this
purpose
, Fig
ure 5.12
, page
16.
• Whenever possible, use 45° elbows, instead of 90°
elbows. The 45° elbow offers less restriction to the flow
of flue gases and intake air.
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.
2
, on page 9.
3.
To install the round support box/wall thimble cover in
a flat ceiling, cut a 10 in. (25
4
mm) square hole in the
ceiling, centered on the hole drilled in Step 2.
Frame the
ho
le as shown in Figure 5.13.
FRAMING
1-1/2 in. (38 mm)
LONG WOOD
SCREWS
CEILING JOISTS
ROUND CEILING
SUPPORT BOX/WALL
THIMBLE COVER
Figure 5.13
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 4.2
, on page 9). 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.
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.
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
