Vertical Vent Tables And Figures - Lennox Hearth Products Montebello LSM40MN-2 Installation Instructions Manual

C
D
Framing Dimensions for Roof
Inches (millimeters)
Pitch C
1 in.
0/12
(0 mm)
1 in.
6/12
(0 mm)
1 in.
12/12
(0 mm)
Figure 18
- Roof Framing
I. Install the roof flashing - Extend the vent
sections through the roof structure. Install the
roof flashing over the vent section and posi-
tion such that the vent column rises vertically
(use carpenters level) (Figure 19 ). 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.
Figure 19
J. Install the storm collar - Install the storm
collar, supplied with the flashing, over the
vent/flashing joint. See Figure 20. Loosen
the storm collar screw. Slide collar down until
it meets the top of the flashing. Tighten the ad-
justing screw. Apply non-combustible caulking
or mastic around the circumference of the joint
to provide a water tight seal.
D
Figure 20
1 in.
(0 mm)
K. Install the vertical termination - The final
15-1/2 in. step involves installation of the Vertical Termina-
(94 mm) tion. Extend the vent sections to the height as
shown in the "Vertical vent termination section"
20-1/2 in.
on Page 6. The Vertical Termination (Figure
(541 mm)
21) installs in the exact same fashion as any
other Secure Vent section. Align the termination
over the end of the previously installed section,
adjusting the radial alignment until the four
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 21
If the vent system extends more than 5' (1.5
m) above the roof flashing, stabilizers may be
necessary. Additional screws may be used at
section joints for added stability. Guide wires
may be attached to the joint for additional sup-
port on multiple joint configurations.
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
VERTICAL VENT FIGURES/TABLES
Note: It is very important that the horizontal/in-
Storm
Collar
clined 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
Z\v" 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.
Note: SV8BF (Secure Vent) firestop/spacer must
be used anytime vent pipe passes through a
combustible floor or ceiling. SV8HF (Secure
Vent) firestop/spacer must be used anytime vent
pipe passes through a combustible wall.
Note: Two 45 degree elbows may be used in
place of one 90 degree elbow. The same rise
to run ratios, as shown in the venting figures
for 90 elbows, must be followed if 45 degree
elbows are used.
Ceiling
Firestop/Spacer
(SV8BF)
Figure 22
- Top Vent - STRAIGHT
40 feet (12.2 meters)
Maximum
6 feet (1.8 meters)
Minimum
1