Lennox Montebello MDLX40IN Installation Instructions Manual page 18

LENNOX HEARTH PRODUCTS • MONTEBELLO
J. Assemble vent run to exterior wall - If not
previously measured, locate the center of the
vent at the exterior wall. Prepare an opening as
described in Step B on Page 17. Assemble the
vent system to point where the terminus of the
last section is within 5" (127 mm) to 8-1/2" (216
mm) inboard of the exterior surface to which
the SV8HTS termination is to be attached, see
Figure 29 and Table 9 on Page 19.
If the terminus of the last section is not within
this distance, use the telescopic vent section
SV8LA, as the last vent section. For wall thick-
nesses greater than that shown in Figure 28,
refer to Table 9 on Page 19. This table lists
the additional venting components needed (in
addition to the termination and adaptor) for a
particular range of wall thicknesses.
K. Attach termination adaptor - Attach the
adaptor (adaptor - SV8RCH - provided with the
termination) to the vent section or telescoping
vent section), or elbow as shown in Figure 27
in the same manner as any SV vent component
(refer to Step E on Page 17).
L. Install Firestop/Spacer at exterior wall
- When using the square termination, install
SV8HF Firestop/Spacer over the opening at the
exterior side of the framing, long side up, with
the 3" spacer clearance at the top as shown in
Figure 27, and nail into place.
(The Firestop/Spacer may also be installed over
the opening at the interior side of the framing).
M. Install the square termination (SV8HTS)
- For the last step, from outside the exterior
wall, slide the collars of the termination onto
the adaptor (the outer over the outer and the
inner inside the inner) until the termination
seats against the exterior wall surface to which
it will be attached. Orient the housing of the
termination with the arrow pointed upwards.
Secure the termination to the exterior wall. The
horizontal termination must not be recessed
into the exterior wall or siding by more than
the 1-1/4" (32 mm) as shown in Figure 28.
IMPORTANT: The vent termination is hot
while in operation and for a period of time
following the use of the fireplace. Young
children should be carefully supervised
when they are in the same area as a hot
termination.
18
DLX DIRECT VENT GAS FIREPLACES (MDLX40/45) • INSTALLATION INSTRUCTIONS
®
To help minimize water infiltration it
is recommended that the Firestop/
Spacer (SV4.5HF) be installed on the
exterior side of the wall.
8-1/2"
(216 mm)
15"
(381 mm)
6-1/2"
(165 mm)
Adaptor
SV8RCH
NOTE: Centerline of Vent Piping is NOT
the Same as the Centerline of the
Framed Opening.
6" to 48" Vent Section,
Telescopic vent section.
Figure 27 - Installing the Square Horizontal Termination (SV8HTS)
Siding
Maximum Extent of Vent
Run Sections to Exterior
Surface of Framing
Last Vent Section. Use
Telescopic Vent Section
(SV8LA), If Necessary
SV8HTS
Square Termination
shown
Stucco
u
For wall thicknesses greater than
8-1/2", see Table 9
Venting Connection and Exterior Wall Recessing
of the Horizontal Square Termination (SV8HTS).
Figure 28 - Wall Thickness and Horizontal Termination Requirements
Horizontal terminations have been designed to perform in a wide range of weather condi-
tions. Our terminations meet or exceed industry standards.
When selecting the locations of your horizontal terminations, do not place the termination
where water from eaves and adjoining rooflines may create a heavy flow of cascading water
onto the termination cap. If the cap must be placed where the possibility of cascading water
exists, it is the responsibility of the builder to direct the water away from the termination cap
by using gutters or other means.
Take care to carefully follow the installation instructions for the termination, including the
use of silicone caulking where required.
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
13"
(330mm)
See Figure 12 on Page 10 for Minimum
Distance to Base of Appliance
Base of Appliance
Interior Surface of
Finished Wall
Adaptor
SV8RCH
SV8HTS
Termination
Shown.
3"
(76 mm)
1"
(25 mm)
1"
(25 mm)
Minimum wall thickness
5" (127 mm)
u
Maximum wall thickness
8-1/2" (216 mm)
Exterior Surface of Siding
Exterior Surface of
Framing
5" to 8-1/2"
(127 to 216 mm)
SV8HTS
Square Termination
Shown
1-1/4" Maximum Recess of
Square Termination into
Exterior Finishing Material