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12
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
Framing Dimensions for Roof
Pitch C D
0/12 10¹⁄₂ in. 10¹⁄₂ in.
(267 mm) (267 mm)
6/12 10¹⁄₂ in. 12 in.
(267 mm) (305 mm)
12/12 10¹⁄₂ in. 17 ³⁄₄ in.
(267 mm) (451 mm)
Figure 23
Figure 24
Figure 26
Figure 25
K. Install the vertical termination - The final
step involves installation of the SV4.5CGV-1
Vertical Termination. Extend the vent sections to
the height as shown in the "Vertical vent termina-
tion section" on page 5. The SV4.5CGV-1 Verti-
cal Termination (
Figure 26
) installs in the exact
same fashion as any other Secure Vent section.
Align the termination over the end of the previ-
ously installed section, adjusting the radial align-
ment until the four locking dimples of the termi-
nation are aligned with the inlets of the four
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.
I. Install the roof flashing - Extend the vent
sections through the roof structure. Install the
roof flashing over the vent section and position
such that the vent column rises vertically (use
carpenters level) (
Figure 24
). Nail along perim-
eter 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.
If the vent system extends more than 5' (1.5 m)
above the roof flashing, stabilizers may be nec-
essary. Additional screws may be used at section
joints for added stability. Guide wires may be
attached to the joint for additional support on
multiple joint configurations.
G. Continue installation of horizontal/inclined
sections - Continue with the installation of the
straight vent sections in horizontal/inclined run
as described in Step C. Install support straps
every 5' (1.52 m) along horizontal/inclined vent
runs using conventional plumber’s tape. It is
very important that the horizontal/inclined
run be maintained in a straight (no dips) and
recommended to be in a slightly elevated
plane, in a direction away from the fireplace
of ¹⁄₄" rise per foot (20 mm per meter) which is
ideal, though rise per foot run ratios that are
smaller are acceptable all the way down to at or
near level. Use a carpenter’s level to measure
from a constant surface and adjust the support
straps as necessary.
It is important to maintain the required clear-
ances to combustibles: 1" (25 mm) at all sides
for all vertical runs; and 3" (76 mm) at the top,
1" (25 mm) at sides, and 1" (25 mm) at the
bottom for all horizontal/inclined runs.
H. Frame roof opening - Identify location for
vent at the roof. Cut and/or frame opening per
Roof Framing Chart and
Figure 23
.
J. Install the storm collar - Install the storm
collar, supplied with the flashing, over the
vent/flashing joint. See
Figure 25.
Loosen the
storm collar screw. Slide collar down until it
meets the top of the flashing. Tighten the
adjusting screw. Apply non-combustible caulk-
ing or mastic around the circumference of the
joint to provide a water tight seal.
Figure 22
Loop the tape around the vent, securing the
ends of the tape to the framing. If desired,
sheet metal screws #6 x ¹⁄₂" length may be
used to secure the support straps to the vent
pipe . Refer to
Figure 21.
F. Change vent direction to horizontal/in-
clined run - At transition from or to a horizon-
tal/inclined run, install the SV4.5E45 and
SV4.5E90 elbows in the same manner as the
straight vent sections. The elbows feature a
twist section to allow them to be routed about
the center axis of their initial collar section to
align with the required direction of the next
vent run element. Twist elbow sections in a
clockwise direction only so as to avoid the
possiblity of unlocking any of the previously
connected vent sections. See
Figure 22
.
SV4.5E90
(90° Elbow)
8 ¹⁄₈"
(206 mm)
Swivel Joint
(360
° swivel)
4 ¹³⁄₁₆"
(122 mm)
SV4.5E45
(45° Elbow)
Swivel Joint
(360
° swivel)
C
D
Storm
Collar