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126718-01N
20
VENTING INSTALLATION
Continued
Figure 18 - Supporting the Vertical Vent Run
Figure 19 - Roof Framing Dimensions
Figure 20 - Installing the Storm Collar
Blocking
Support straps
(Plumber’s tape)
8 ft (2.4 m)
maximum
1” (26 mm)
minimum
clearance to
combustibles
1. Change vent direction of horizontal/inclined run
—Install
the SV4.5E45 and SV4.5E90 elbows in the same manner as
the straight vent sections. See Vent elbows on
Page 17
for
more information.
2. Continue installation of horizontal/inclined sections
—Con-
tinue with the installation of the straight vent sections in
horizontal/inclined run. Install support straps every 5 ft (1.52
m) along horizontal/inclined vent runs using conventional
plumber’s tape. Rise per foot run ratios are acceptable all
the way to level. For best results, maintain the horizontal/
inclined run in a straight (no dips), slightly elevated plane
of approximately 1/4” per 1 ft (20 mm per 1 m). Maintain
the required clearances to combustibles
(
Page 9
).
3. Frame the roof opening
—Identify the location for the vent
at the roof. Cut and/or frame opening
(
Figure 19
).
C
D
Pitch
C
D
0/12
10 1/2” (267 mm)
10 1/2” (267 mm)
6/12
10 1/2” (267 mm)
12” (305 mm)
12/12
10 1/2” (267 mm)
17 3/4” (451 mm)
1. Install the roof flashing
—Extend the vent sections through
the roof structure. Install the roof flashing over the vent sec-
tion and position such that the vent column rises vertically
(use carpenters level). Nail along perimeter to secure flashing
or adjust roofing to overlap the flashing edges at top and
sides only and trim where necessary. Seal the top and both
sides of the flashing with waterproof caulking.
2. Install the storm collar
—Install the storm collar, supplied
with the flashing, over the vent/flashing joint
(
Figure 20
).
Loosen the storm collar screw. Slide collar down until it meets
the top of the flashing. Tighten the adjusting screw. Apply
non-combustible caulking or mastic around the circumfer-
ence of the joint to provide a water tight seal.
Storm
Collar
Figure 21 - Installing the Vertical Termination
1. Install the vertical termination
—The final step involves installation
of the SV4.5CGV-1 vertical termination. Align the termination over the
end of the previously installed section, adjusting the radial alignment
until the four (4) locking dimples of the termination are aligned with
the inlets of the four (4) incline channels of the last vent section. Push
the termination down until it fully engages, then twist the termination
clockwise running the dimples down and along the incline channels
until they seat at the end of the channels. If the vent system extends
more than 5 ft (1.5 m) above the roof flashing, stabilizers may be
necessary. Additional screws may be used at section joints for added
stability. Guide wires or roof support assemblies may be attached
to the joint for additional support on multiple joint configurations.
