Lennox Hearth Products LSS-35CN Installation Instructions Manual page 14

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 20 .
4 ¹³⁄₁₆"
(122 mm)
Swivel Joint
°
(360 swivel)
(360
SV4.5E45
(45° Elbow)
Figure 20
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 21 .
14
7 ⁵⁄₈"
(194 mm)
Swivel Joint
°
swivel)
SV4.5E90
(90° Elbow)
Figure 21
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 22 ). Nail along perim-
eter to secure flashing or adjust roofing to over-
lap the flashing edges at top and sides only and
trim where necessary. Seal the top and both
sides of the flashing with waterproof caulking.
Figure 22
J. Install the storm collar - Install the storm
collar, supplied with the flashing, over the
vent/flashing joint. See Figure 23. 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.
C
D
Framing Dimensions for Roof
Pitch C D
0/12 10-1/2 in. 10-1/2 in.
(267 mm) (267 mm)
6/12 10-1/2 in. 12 in.
(267 mm) (305 mm)
12/12 10-1/2 in. 17-3/4 in.
(267 mm) (451 mm)
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
Figure 23
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 9. The SV4.5CGV-1 Ver-
tical Termination ( Figure 24 ) 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 locking dimples of the termination
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.
Figure 24
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.
Storm
Collar