19
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" (178 mm) to 11-1/4" (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" (32 mm) as
shown in
Figure 34
.
SVHRK Snorkel Cap
- The snorkel cap is
designed 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" (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
Termination
Guard
. See
Page 36.
This can be
purchased at your local dealer.
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” Vent Section,
Telescopic vent section,
Elbow or Appliance Collar
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.
Siding
Stucco
1-1/4" Maximum Recess of
the Square Termination into
Exterior Finishing Material
Exterior Surface of
Framing
6” to 9-1/4”
(152 to 235 mm)**
Exterior Surface of Siding
Interior Surface of
Finished Wall
Maximum wall thickness
10” (254 mm)**
SV4.5HT-2
Square Termination
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 V e n t
Section (SV4.5LA), If
Necessary
Adaptor
SV4.5RCH
SV4.5HT-2
Square Termination
Venting Connection and Exterior Wall Recessing of the
Horizontal Square Termination (SV4.5HT-2).
*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” see
Table 8
.
*Caulk
*Caulk
** For thicknesses greater than
10" (254mm) see
Table 9.
To help minimize water infil-
tration it is recommended that
the Firestop/Spacer (SV4.5HF)
be installed on the exterior
side of the wall.
See
Figure 12
on
Page 10
for Min.
distance to Base of Appliance.
