Lennox Hearth Products MPD35ST-NM-B Installation Instructions Manual page 21

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 7 in. (178 mm) to 11-1/4 in. (286
mm) inboard of the exterior surface to which
the SV4.5 HT termination is to be attached, see
Figure 36. 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 36, refer to Table 8 on page 22. 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 telescoping
vent section), elbow or appliance collar as shown
in Figure 35 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 exterior
side of the framing, long side up, with the 3 inch
spacer clearance at the top as shown in Figure
35, and nail into place.
(The Firestop/Spacer may also be installed over
the opening at the interior side of the framing.)
M. Install the desired termination -
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
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 36.
SVHRK Snorkel Cap –The snorkel cap is de-
signed to be fitted into a basement window box.
The SVHRK cap is for use with flex vent
The vertical distance between the inlet and outlet
of the cap is 28 in. (711 mm). pipe.
IMPORTANT: The vent termination is hot
while in operation and for a period of
time following the use of the fireplace.
To prevent contact with hot surfaces,
we recommend the use of a Termina-
tion Guard. See Page 38. This can be
purchased at your local dealer.
7"
(178)
12-1/8"
(308 mm)
5-1/8"
(130 mm)
Adapter
SV4.5RCH
6 to 48 inch Vent Section,
Telescopic vent section,
Elbow or Appliance Collar
Figure 35
Installing the Square Horizontal Termination (SV4.5HT-2)
*Use silicone caulking to seal
the top and sides of the
termination, up to the
underlayment, stucco, or
m a s o n r y w a l l s u r f a c e .
Maximum Extent of
Siding
Vent Run Sections
*Caulk 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
*Caulk
SV4.5HT-2
Square Termination
**For thicknesses greater
Stucco
than 10 inches, see Table 8.
Venting Connection and Exterior Wall Recessing of the
Horizontal Square Termination (SV4.5HT-2).
Figure 36
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 ARE NOT TO SCALE.
Firestop/Spacer (SV4.5HF) shown
on the exterior side of the wall. It
may also be installed on the
interior side.
10-1/2"
(267mm)
Note: Centerline of Vent Piping is
NOT the Same as the Centerline of
the Framed Opening.
See Figures 13 and 14 on pages
10 and 11 for Min. Distance to
Base of Appliance.
Base of Appliance
Interior Surface of
Finished Wall
V e n t
Adapter
SV4.5RCH
SV4.5HT-2
Termination
3"
(76 mm)
1"
(25.4 mm)
Maximum wall thickness
10 in.(254 mm)**
Exterior Surface of Siding
Exterior Surface of
Framing
6 in. to 9-1/4 in.
(152 to 235 mm)**
SV4.5HT-2
Square Termination
1-1/4" Maximum Recess of
the Square Termination into
Exterior Finishing Material
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