Lennox MPD35ST-NM-B Installation Instructions Manual page 19

Push the vent component against the collar
until it fully engages, then twist the component
clockwise, running the dimples down and along
the incline channels until they seat at the end of
the channels. The unitized design of the Secure
Vent components will engage and seal both the
inner and outer pipe elements with the same
procedure. Sealant and securing screws are
not required.
E. Attach vent components to each other -
Other vent sections may be added to the previ-
ously installed section in accordance with the
requirements of the vent tables.
To add another vent component to a length of
vent run, align the dimpled end of the component
over the inclined channel end of the previously
installed section, adjusting the radial alignment
until the four locking dimples are aligned with the
inlets of the four incline channels of the previous
section. Push the vent component against the
previous section until it fully engages, then twist
the component clockwise running the dimples
down and along the incline channels until they
seat at the end of the channels. This seating
position is indicated by the alignment of the
arrow and dimple as shown in Figure 20 on
Page 14.
F. Install firestop / spacer at ceiling -
When using Secure Vent, use SV4.5VF firestop
/ spacer at ceiling joists; when using Secure
Flex, use SF4.5VF firestop / spacer. If there is
living space above the ceiling level, the firestop/
spacer must be installed on the bottom side of
the ceiling. If attic space is above the ceiling, the
firestop/ spacer must be installed on the top side
of the joist. Route the vent sections through the
framed opening and secure the firestop / spacer
with 8d nails or other appropriate fasteners at
each corner.
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 Items 12 and 13 on Page 34.
This can be purchased at your
local dealer.
7"
(178)
12¹⁄₈"
(308 mm)
5¹⁄₈"
(130 mm)
Adapter
SV4.5RCH
6 to 48 inch Vent Section,
Telescopic vent section,
Elbow or Appliance Collar
Figure 33 -
INSTALLING SQUARE HORIZONTAL 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.
Siding
�
Caulk
Last Vent Section.
Use Telescopic Vent
Section (SV4.5LA), If
Necessary
�
Caulk
SV4.5 HT-2
Termination
Stucco
v
For thicknesses greater
than 10", see Table 11
Venting Connection and Exterior Wall Recessing of the Horizontal Square
Figure 34
Termination (SV4.5HT-2).
Horizontal terminations have been designed to perform in a wide range of weather condi-
tions. Our terminations meet or exceed industry standards.
When selecting the locations of your horizontal terminations, do not place the termina-
tion where water from eaves and adjoining rooflines may create a heavy flow of cascad-
ing 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.
To help minimize water infiltration it is
recommended that the Firestop/Spacer
(SV4.5HF) be installed on the exterior
side of the wall.
10¹⁄₂"
(267mm)
Note: Centerline of Vent Piping is
NOT the Same as the Centerline of
the Framed Opening.
See Figures 13A & 13B for Min.
Distance to Base of Appliance.
Base of Appliance
Interior Surface of
Finished Wall
Maximum Extent of
Vent Run Sections
Relative to Exterior
Surface of Framing
Adapter
SV4.5RCH
SV4.5 HT-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)
SV4.5 HT-2
Termination
1-1/4" Maximum Recess of
Square Termination
into Exterior Finishing Material
9