Lennox Hearth Products LSS-35CN Installation Instructions Manual page 17

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
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 9-1/4 in. (235 mm)
inboard of the exterior surface to which the
termination is to be attached, see Figure 30 . If
the terminus of the last section is not within this
distance, use the telescopic vent section
SV4.5LA, as the last vent section. For wall
thicknesses greater than that shown in Figure
30 , refer to Table 3 on page 18 . 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 - SV4.5RCH - provided with
the termination) to the vent section or tele-
scoping vent section), elbow or appliance col-
lar as shown in Figure 29 in the same manner
as any SV4.5 vent component (refer to Step E).
L. Install Firestop/Spacer at exterior wall -
When using the square termination, install
SV4.5HF (Secure Vent), SF4.5HF (Secure Flex)
Firestop/Spacer over the opening at the exte-
rior side of the framing, long side up, with the
3 inch spacer clearance at the top as shown in
Figure 29 , and nail into place. (The Firestop/
Spacer may also be installed over the opening
at the interior side of the framing).
1. Install the square termination (SV4.5HT-2)
- 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 termina-
tion with the arrow pointed upwards. Secure
the termination to the exterior wall.
Orient the housing of the termination with the
arrow pointed upwards. Secure the termina-
tion to the exterior wall.
SFHRK Snorkel Cap –The snorkel cap is de-
signed to be fitted into a basement window
box. The SFHRK cap is for use with flex vent
pipe. The SV4.5HRK14 and SV4.5HRK36 are
for rigid vent pipe.
IMPORTANT: The vent termination is hot
while in operation and for a period of time
following use of the fireplace. To prevent
contact with hot surfaces, we recommend
the use of a Termination Guard. This can be
purchased at your local dealer.
7"
(178)
12¹⁄₈"
(308 mm)
5¹⁄₈"
(130 mm)
Adapter
SV4.5RCH
Note: Centerline of Vent Piping is
NOT the Same as the Centerline of
6 to 48 inch Vent Section,
Telescopic vent section,
Elbow or Appliance Collar
Installing the Square Horizontal Termination (SV4.5HT-2).
Figure 29
Maximum Extent of
Siding
Vent Run Sections
Relative to Exterior
Surface of Framing
Last Vent Section. Use
T e l e s c o p i c
Section (SV4.5LA), If
Necessary
SV4.5HT
Square
Termination
Stucco
Note: Venting terminals shall not be recessed into
a wall or siding.
Venting Connection and Exterior Wall Recessing of the
Horizontal Square Termination (SV4.5HT).
Figure 30
Horizontal terminations have been designed to perform in a wide range of weather
conditions. 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 NOT TO SCALE.
Firestop/Spacer (SV4.5HF) shown
on the exterior side of the wall. It
may also be installed on the
interior side.
10¹⁄₂"
(267mm)
the Framed Opening.
See Figure 4 on page 5
for Min. Distance to Base
Base of Appliance
Interior Surface of
Finished Wall
V e n t
Adapter
SV4.5RCH
(Provided With The
Termination)
SV4.5 HT
Termination
3"
(76 mm)
1"
(25.4 mm)
of Appliance.
Minimum wall thickness
5 in. (127 mm)
Maximum wall thickness
9¹ ₄ in.(235 mm)
Exterior Surface of Siding
Exterior Surface of
Framing
5 in. to 9 ¹ ₄ in.
(127 to 235 mm)
SV4.5HT
Square Termination
1¹⁄₄" Maximum Recess of
Either Square Termination into
Exterior Finishing Material
17