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LENNOX HEARTH PRODUCTS • MONTEBELLO
hORIZONTAL (OUTSIDE WALL)
TERMINATION SYSTEM
See Figures 16 and 17 on Page 15 illustrating
the various horizontal venting configurations
that are possible for use with these appliances.
The table in Figure 17 on Page 15 shows each
system's minimum and maximum vertical and
horizontal length values that can be used to
design and install the vent components in a
variety of applications.
The horizontal vent system terminates through
an outside wall. Building Codes limit or prohibit
terminating in specific areas. Refer to Figure 4
on Page 7 for location guidelines.
Secure Vent™ SV4.5 direct-vent system com-
ponents are unitized concentric pipe compo-
nents featuring positive twist lock connection,
(refer to Figure 13 on Page 14). All of the
appliances covered in this document are fitted
with collars having locking inclined channels.
The dimpled end of the vent components fit
over the appliance collar to create the positive
twist lock connection.
A. Plan the vent run -
Analyze the vent routing and determine the
types and quantities of sections required
4-1/2" (114 mm), 10-1/2" (267 mm), 22-1/2"
(572 mm), 34-1/2" (876 mm) and 46-1/2"
(1181 mm) net section lengths are available.
Make allowances for elbows as indicated in
Figure 15 on Page 14.
Maintain a minimum 1" (25 mm) clearance
to combustibles on the vertical sections.
Clearances for the horizontal runs are; 3"
(76 mm) on top, 1" (25 mm) on sides, and
1" (25 mm) at the bottom.
B. Frame exterior wall opening -
Locate the center of the vent outlet on the
exterior wall according to the dimensions
shown in Figure 8 on Page 10.
Cut and/or frame an opening, 10-1/2" x 12-
1/8" (267 mm x 308 mm) inside dimensions,
about this center.
C. Frame ceiling opening - If the vertical route is
to penetrate a ceiling, use plumb line to locate
the center above the appliance. Cut and/or
frame an opening, 10-1/2" x 10-1/2"(267
mm x 267 mm) inside dimensions, about
this center (refer to Figure 12 on Page 14).
16
POWER VENT DV GAS FIREPLACES (LSM40/45EN-PV) • INSTALLATION INSTRUCTIONS
®
D. Attach vent components to appliance - To
attach a vent component to the appliance
collar, align the dimpled end over the collar,
adjusting the radial alignment until the four
locking dimples are aligned with the inlets of
the four incline channels on the collar (refer
to Figure 13 on Page 14).
Push the vent component against the collar
until it fully engages, then twist the compo-
nent clockwise, running the dimples down
and along the incline channels until they
seat at the end of the channels. The unitized
design of the Secure Vent components will
engage and seal both the inner and outer pipe
elements with the same procedure. Sealant
and securing screws are not required.
E. Attach vent components to each other -
Other vent sections may be added to the
previously installed section in accordance
with the requirements of the vent tables.
To add another vent component to a length
of vent run, align the dimpled end of the
component over the inclined channel end of
the previously installed section, adjusting the
radial alignment until the four locking dimples
are aligned with the inlets of the four incline
channels of the previous section. Push
the vent component against the previous
section until it fully engages, then twist the
component clockwise running the dimples
down and along the incline channels until they
seat at the end of the channels. This seating
position is indicated by the alignment of
the arrow and dimple as shown in Figure
13 on Page 14.
F. Install firestop/spacer at ceiling -
When using Secure Vent, use SV4.5VF fire-
stop/spacer at ceiling joists. If there is living
space above the ceiling level, the firestop/
spacer must be installed on the bottom side
of the ceiling. If attic space is above the ceil-
ing, the firestop/ spacer must be installed
on the top side of the joist. Route the vent
sections through the framed opening and
secure the firestop/spacer with 8d nails or
other appropriate fasteners at each corner.
Remember to maintain 1" (25 mm) clear-
ance to combustibles, framing members,
and attic or ceiling insulation when running
vertical chimney sections.
G. Support the vertical run sections -
On the vertical run, support the venting
system every 8 feet (2.4m) above the fire-
place vent outlet with field provided support
straps (Plumber's tape). Attach the straps
to the vent pipe and secure to the framing
members with nails or screws.
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
h.Change vent direction - At transition from
or to a horizontal/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 possibility of unlocking
any of the previously connected vent sec-
tions (see Figure 13 on Page 14).
I. Continue installation of horizontal/inclined
sections - Continue with the installation
of the straight vent sections in horizontal/
inclined run as described in Step E. Install
support straps every 3 feet (1914 mm)
along horizontal/inclined vent runs using
conventional plumber's tape.
See Figure 16 on Page 15. It is very im-
portant that the horizontal/inclined run be
maintained in a straight (no dips), slightly
elevated plane. The recommended incline
is approximately 1/4" per foot (20 mm per
meter) horizontal, in a direction away from
the fireplace. The 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.
Installing Power Vent Termination
J. Assemble vent run to exterior wall - If not
previously measured, locate the center of
the vent on the exterior wall. Prepare an
opening as described in this manual. As-
semble the vent system to a point where
the terminus of the last section is within 8
inches of the outside wall surface where
the power vent is to be mounted (refer to
Figure 19 on Page 17).
If the terminus of the last section is not
within this distance, use the telescopic
vent section SV4.5LA, as the last vent
section. For wall thicknesses greater than
that shown in Figure 19 (Page 17), refer to
Table 8 (Page 17) for the additional vent-
ing components needed (in addition to the
termination and adaptor) for a particular
range of wall thicknesses.
K. Attach termination adaptor - Attach the
adaptor (adaptor - SV4.5RCH - provided
with the power vent kit) to the vent section
telescoping vent section, or elbow, as shown
in Figures 18 and 19 (Page 17) in the same
manner as any SV4.5 vent component.
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