Lennox Hearth Products Montebello LSM40MN-2 Installation Instructions Manual page 16

It is important to maintain the required clear-
ances to combustibles: 1" (25 mm) at all sides
for all vertical runs; and " (76 mm) at the top,
1" (25 mm) at sides, and 1" (25 mm) at the
bottom for all horizontal/inclined runs
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. Assemble the vent
system to point where the terminus of the last
section is within 5 in. (127 mm) to 8-1/2 in. (216
mm) inboard of the exterior surface to which
the SV8HTS termination is to be attached, see
Figure 27. 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
thicknesses greater than that shown in Figure
27, refer to Table 6 on Page 17. This table lists
the additional venting components needed (in
addition to the termination and adapter) for a
particular range of wall thicknesses.
K. Attach termination adapter - Attach the
adapter (adapter - SV8RCH - provided with the
termination) to the vent section or telescoping
vent section), or elbow as shown in Figure 26
in the same manner as any SV vent component
(refer to Step E).
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 inch spacer clearance at the top as shown
in Figure 26, 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 adapter (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 27.
16
8 ¹⁄₂"
(216)
15"
(81 mm)
6 ¹⁄₂"
(165 mm)
Adapter
SV8RCH
6 to 48 inch Vent Section,
Telescopic vent section.
Figure 26 Installing the Square Horizontal Termination (SV8HTS)
Siding
Maximum Extent of
Vent Run Sections
Relative to Exterior
Surface of Framing
Last Vent Section. Use
T e l e s c o p i c
Section (SV8LA), If
Necessary
SV8HTS
Square Termination
shown
Stucco
Venting Connection and Exterior Wall Recessing
of the Horizontal Square Termination (SV8HTS).
Figure 27
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Firestop/Spacer (SV8HF) shown
on the exterior side of the wall. It
may also be installed on the
interior side.
1"
(0mm)
Note: Centerline of Vent Piping is
NOT the Same as the Centerline of
the Framed Opening.
See Figure 9 on page 7
for Min. Distance to Base
Base of Appliance
Interior Surface of
Finished Wall
V e n t
Adapter
SV8RCH
SV8HTS
Termination
Shown.
"
(76 mm)
1"
(25 mm)
1"
(25 mm)
of Appliance.
Minimum wall thickness
5 in. (127 mm)
Maximum wall thickness
8-1/2 in. (216 mm)
Exterior Surface of Siding
Exterior Surface of
Framing
5 in. to 8-1/2 in.
(127 to 216 mm)
SV8HTS
Square Termination
Shown
1-1/4" Maximum Recess of
Square Termination into
Exterior Finishing Material