16
Heat & Glo • TIARA II-B • 7011-148 Rev. G • 10/12
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 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.
Shingles overlap on
top edge of flashing
CAP AND STORM
COLLAR NOT SHOWN
FOR CLARITY
Figure 5.14
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
Ceiling Firestop
Nails
Minimum 1 in.
(25mm) Clearance
Minimum 1 in.
(25mm) Clearance
Minimum 1 in.
(25mm) Clearance
Minimum 1 in.
(25mm) Clearance
Figure 5.16
Fire Risk.
Explosion Risk.
WARNING
• Any occupied areas above the first floor, including
closets and storage spaces, which the vertical
vent passed through must be enclosed. The
enclosure may be framed and sheetrocked with
standard construction materials; however, refer
to these installation instructions for the minimum
allowable clearance between the outside of the
vent pipe and the combustible surfaces of the
enclosure. Do not fill any of the required air space
with insulation.
Step 9.
Twist-lock the vent cap and seal.
Note:
For multi-story vertical installations, a ceiling firestop
is required at the second floor, and any subsequent floors
(
Figure 5.16
). The opening should be framed to 10 in. x
10 in. (254mm x 254mm) inside dimensions, in the same
manner as shown in
Figure 5.13
, on the previous page.
