20
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX HEARTH PRODUCTS • MERIT PLUS
®
DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS
Figure 33: Installing the Square Horizontal Termination (SV4.5HT-2)
Figure 34: Venting Connection and Exterior Wall Recessing of the Horizontal
Square Termination (SV4.5HT-2)
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 34. 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 34, refer
to Table 9 on Page 21. 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 (SV4.5RCH, provided with
the termination) to the vent section or
telescoping vent section), elbow or appliance
collar as shown in Figure 33 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 33, 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 or SV4.5HTSS)—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 in. (32 mm)
as shown in Figure 34.
SVHRK Snorkel Cap—The snorkel cap
is designed to be fi tted into a basement
window box. The SVHRK cap is for use with
fl ex 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
fi replace. To prevent contact with hot
surfaces, we recommend the use of a
Termination Guard. See Page 36. This
can be purchased at your local dealer.
Siding
Stucco
1-1/4" Maximum Recess of
the Square Termination into
Exterior Finishing Material
Exterior Surface of
Framing
6 in. to 9-1/4 in.
(152 to 235 mm)**
Exterior Surface of Siding
Interior Surface of
Finished Wall
Maximum wall thickness
10 in.(254 mm)**
SV4.5HT-2
Square Termination
Maximum Extent of
Vent Run Sections
Relative to Exterior
Surface of Framing
Last Vent Section. Use
Telescopic Vent
Section (SV4.5LA), If
Necessary
Adapter
SV4.5RCH
SV4.5HT-2
Square Termination
*Use silicone caulking to seal
the top and sides of the
termination, up to the
underlayment, stucco, or
masonry wall surface.
**For thicknesses greater
than 10 inches, see Table 8.
*Caulk
*Caulk
SV4.5HT-2
Termination
10-1/2 in.
(267mm)
7 in.
(178)
5-1/8 in.
(130 mm)
12-1/8 in.
(308 mm)
Note: Centerline of Vent Piping is
NOT the Same as the Centerline of
the Framed Opening.
6 to 48 in. Vent Section,
Telescopic vent section,
Elbow or Appliance Collar
See Figure 13 on Page 11
for Min. Distance to Base
of Appliance.
Base of Appliance
3 in.
(76 mm)
1 in.
(25.4 mm)
Adapter
SV4.5RCH
To help minimize water
infiltration it is recommended that
the Firestop/Spacer (SV4.5HF)
be installed on the exterior
side of the wall.
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 roofl ines may create a heavy fl ow
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.
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