Horizontal Termination System - Lennox Montebello MDLX40IN Installation Instructions Manual

LENNOX HEARTH PRODUCTS • MONTEBELLO
HORIZONTAL (OUTSIDE WALL) TERMINATION
SYSTEM
See Figures 26 - 31 and their associated
Horizontal Vent tables that illustrate the vari-
ous horizontal venting configurations that are
possible for use with these appliances. Secure
Vent pipe applications are shown in these
®
Figures. A Horizontal Vent table summarizes
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 6
on Page 7 for location guidelines.
Secure Vent SV8 direct-vent system compo-
nents are unitized concentric pipe components
featuring positive twist lock connection, (refer
to Figure 17 on Page 14). All of the appli-
ances 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"(876mm)and46-1/2"(1181mm)net
section lengths are available. It is recommended
that you plan the venting so that a joint does not
occur in the ceiling or roof joists. Allow for elbows
as indicated in Figure 20 on Page 15.
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
11 on Page 10. Cut and/or frame an opening,
15" x 13" (381 mm x 330 mm) inside dimen-
sions, with 9" above center and 7" below 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, 13" x 13" (330 mm x
330 mm) inside dimensions, about this center
(refer to Figure 17 on Page 14).
D. Attach vent components to appliance - To
attach a vent component to the appliance collar,
align the dimpled end over the collar, adjust-
ing the radial alignment until the four locking
dimples are aligned with the inlets of the four
incline channels on the collar (refer to Figure
16 on Page 14).
DLX DIRECT VENT GAS FIREPLACES (MDLX40/45) • INSTALLATION INSTRUCTIONS
®
Support
Building
Brackets
Support
Framing
SV8E90
Elbow
Ceiling
Firestop/Spacer
Vertical
Rise
Support the vertical portion of the venting system
every 8 feet (2.4m) above the fireplace vent outlet.
Figure 26 - Typical Horizontal Vent Installation
Push the vent component against the collar
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. 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 re-
quirements 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
17 on Page 14.
F. Install firestop/spacer at ceiling - When
using Secure Vent, use SV8BF firestop/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 ceiling, 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) clearance
to combustibles, framing members, and attic
or ceiling insulation when running vertical
chimney sections.
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Horizontal / Inclined Run
SV8 L6/12/24/36/48
Vent Sections
Support Bracket Spacing
Every 3 ft (914 mm)
2-1/2 Foot Vertical
Vent (min.)
Fireplace
G. Support the vertical run sections - See Step
E on Page 14.
H. Change vent direction - At transition from or
to a horizontal/inclined run, install the SV8E45
and SV8E90 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 sections (see Figure 17 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 on Page 14. Install
support straps every 3 feet (1914 mm) along
horizontal/inclined vent runs using conventional
plumber's tape.
See Figure 26, It is very important 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.
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.
Use a carpenter's level to measure from a
constant surface and adjust the support straps
as necessary.
SV8HTS
Termination
Shown
Exterior
Wall
SV8HTS
Termination
Shown
Exterior
Wall
17