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LENNOX HEARTH PRODUCTS • MONTEBELLO
HORIZONTAL (OUTSIDE WALL)
TERMINATION SYSTEM
See Figures 26–31 and their associated
Horizontal Vent tables that illustrate the
various 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
components are unitized concentric pipe
components featuring positive twist lock
connection, (refer to Figure 17 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 in. (114 mm), 10-1/2 in. (267 mm),
22-1/2 in. (572 mm), 34-1/2 in. (876 mm)
and 46-1/2 in. (1181 mm) net section lengths
are available. It is recommended that you
plan the vent lengths so that a joint does
not occur at the intersection of ceiling or
roof joists. Make allowances for elbows as
indicated in Figure 20 on Page 15.
Maintain a minimum 1 in. (25 mm)
clearance to combustibles on the vertical
sections. Clearances for the horizontal
runs are; 3 in. (76 mm) on top, 1 in. (25
mm) on sides, and 1 in. (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 in. x 13 in. (381 mm x 330 mm) inside
dimensions, with 9 in. above center and 7 in.
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 in. x 13 in. (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,
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 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 previ-
ously 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
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 in. (25 mm) clear-
ance 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 in. (25 mm) at all
sides for all vertical runs; and 3 in. (76 mm)
at the top, 1 in. (25 mm) at sides, and 1 in.
(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
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