21
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX HEARTH PRODUCTS • MERIT PLUS
®
DIRECT VENT GAS FIREPLACES (MPDP35/40) • INSTALLATION INSTRUCTIONS
Figure 40: Installing the Square Horizontal Termination (SV4.5HT-2)
Figure 41
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 at-
tached, see Figure 40. 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 40, refer to Table 8 on
Page 22. This table lists the additional venting
components needed (in addition to the termi-
nation and adaptor) for a particular range of
wall thicknesses.
K. Attach termination adaptor. Attach the adap-
tor (adaptor - SV4.5RCH - provided with the
termination) to the vent section or telescoping
vent section), elbow or appliance collar as shown
in Figure 40 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 40, and nail into place. The Firestop/
Spacer may also be installed over the opening at
the interior side of the framing. The gap between
the vent pipe and a firestop can be sealed with
noncombustible caulking.
M. Install the desired termination.
1. Install the square termination (SV4.5HT-2
or SV4.5HTSS). 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 41.
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).
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 36). This can be
purchased at your local dealer.
Firestop/Spacer (SV4.5HF) shown
on the exterior side of the wall. It
may also be installed on the
interior side.
SV4.5HT-2
Termination
10-1/2"
(267mm)
7"
(178)
5-1/8"
(130 mm)
12-1/8"
(308 mm)
Note: Centerline of Vent Piping is
NOT the Same as the Centerline of
the Framed Opening.
6 to 48 inch Vent Section,
Telescopic vent section,
Elbow or Appliance Collar
See Figure 12 on Page 11
for Min. Distance to Base
of Appliance.
Base of Appliance
3"
(76 mm)
1"
(25.4 mm)
Adaptor
SV4.5RCH
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.
To help minimize water infil-
tration it is recommended that
the Firestop/Spacer (SV4.5HF)
be installed on the exterior
side of the wall.
* Use silicone caulking to
seal the top and sides of the
termination, up to the under-
layment, stucco, or masonry
wall surface.
Venting Connection and Exterior Wall Recessing of the
Horizontal Square Termination (SV4.5HT-2).
Adaptor
SV4.5RCH
**For thicknesses greater
than 10 inches, see Table 8.
SV4.5HT-2
Square Termination
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)**
1-1/4 in. Maximum Recess
of the Square Termination
into Exterior Finishing
Material
See Figure 12 on Page 10
for Min. Distance to Base
of Appliance.
SV4.5HT-2
Square Termination
*Caulk
*Caulk
Stucco
Siding
Interior Surface of
Finished Wall
Last Vent Section. Use
Telescopic Vent Section
(SV4.5LA), If Necessary
Maximum Extent of
Vent Run Sections
Relative to Exterior
Surface of Framing
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