Horizontal Termination System - Lennox MPDT33RNM Installation Instructions Manual

LENNOX HEARTH PRODUCTS • MERIT PLUS
HORIZONTAL (OUTSIdE WALL) TERMINATION
SYSTEM
Figure 32, and Figures 35 to 41 on Pages
21 to 23 and their associated Horizontal
Vent Table illustrate the various horizontal
venting configurations that are possible for
use with these appliances. Secure Vent
applications are shown in these figures; Secure
Flex pipe may also be used. 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. Both of
these horizontal vent systems terminate through
an outside wall. Building Codes limit or prohibit
terminating in specific areas. Refer to Figure 7
on Page 7 for location guidelines.
Secure Vent SV4.5 direct vent system compon-
ents are unitized concentric pipe components
featuring positive twist lock connection, (refer
to Figure 21 on Page 15). 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. 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 23 on Page 16.
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
12 on Page 11. 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 20 on Page 15).
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 21 on Page 15).
18
DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS
®
Support
Building
Brackets
Support
Framing
SV4.5E90
Elbow
pipe
®
Ceiling
Vertical
Rise
Figure 32 - 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.
NOTE: An elbow may also be attached to the
appliance collar. Attach in the same manner as
you would a vent section.
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 21 on Page 15.
F. Install firestop/spacer at ceiling - When
using Secure Vent, use SV4.5VF firestop/spacer
at ceiling joists; when using Secure Flex
SF4.5VF firestop/spacer. 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.
TYPICAL HORIZONTAL VENT INSTALLATION
Horizontal / Inclined Run
SV4.5L6/12/24/36/48
Vent Sections
Firestop/Spacer
Support bracket spacing
every 5 ft (1.52 m)
See Figure 24 on Page 15 for
vertical vent section support.
Fireplace
G. Support the vertical run sections - On the
vertical run, support the venting system every
8 feet (2.4m) above the fireplace 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. See Figure 22 on Page 15.
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
possiblity of unlocking any of the previously
connected vent sections. See Figure 23 on
Page 16.
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 5 ft. (1.52 m) along horizontal/inclined
vent runs using conventional plumber's tape.
See Figure 32, 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
, use
®
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
clearances 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.
SV4.5HT-2
Termination
Exterior
Wall
SV4.5HT-2
Termination
Exterior
Wall