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LENNOX HEARTH PRODUCTS • MONTEBELLO
A. Frame ceiling opening—Use a plumb line
from the ceiling above the appliance to locate
center of the vertical run. Cut and/or frame
an opening, 10 1/2 in. x 10 1/2 in. (267 mm x
267 mm) inside dimensions, about this center
mark (Figure 12).
Plumb Bob
Ceiling Framing
Figure 12: Framing Ceiling Opening
B. Attach adaptor (with probe) to appliance
collar—Secure Vent
SV4.5 direct-vent
®
system components are unitized concentric
pipe components featuring positive twist lock
connections (see Figure 13).
All of the appliances covered in this
document are fitted with collars having
locking inclined channels. The dimpled end
of the adaptor fits over the appliance collar to
create the positive twist lock connection.
Align the dimple (four places) of the
upper vent section with the opening
of the locking incline channel on
the lower vent section or appliance
collar. Twist vent component
clockwise to engage and seal until
arrow and dimple align.
Arrow
Dimple
Locking Incline
Channel
Connected Vent
Sections
Adaptor on Appliance Collar
or Vent Section
Figure 13: Attaching the Vent Adaptor
To attach a vent component to the adaptor
on appliance collar, align the dimpled end
over the adaptor collar, adjusting the radial
alignment until the four locking dimples are
aligned with the inlet of the four inclined
channels on the collar (refer to Figure 13).
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.
14
DLX POWER VENT DV GAS FIREPLACES (MDLX40/45IN-PV) • INSTALLATION INSTRUCTIONS
®
The unitized design of the Secure Vent
components will engage and seal both the inner
and outer pipe without the need for sealant or
screws. If desired a #6 x 1/2 in. screw may be
used at the joint, but it is not required as the
pipe will securely lock when twisted.
C. Attach vent components to each other—
Other vent sections may be added to the
previously installed section in accordance
10 1/2 in. min.
with the requirements shown in Figures 16
(267 mm)
and 17 on Page 15.
10 1/2 in. min.
To add another vent component to a length
(267 mm)
of vent run, align the dimpled end 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 13.
D. Install firestop/spacer at ceiling—When
using Secure Vent, use SV4.5VF firestop/
spacer at ceiling joists. 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.
Maintain 1 in. (25 mm) clearance to
combustibles, framing members, and attic
or ceiling insulation when running vertical
chimney sections. Attic insulation shield
(H3907) may be used to obtain the required
clearances indicated here. See installation
accessories on Page 28. The gap between
the vent pipe and a vertical firestop may be
sealed with noncombustible caulking.
E. Support the vertical vent run sections -
Arrow
Figure 14: Supporting Vertical Vents
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Support the vertical portion of the venting
®
system every eight feet (2.4 m) above the
fireplace vent outlet. One method of support
is by utilizing field provided support straps
(conventional plumber's tape). Secure the
plumber's tape to the framing members
with nails or screws. Strap the tape around
the vent, securing the ends of the tape to
the framing. If desired, sheet metal screws
#6 x 1/2 in. length may be used to secure the
support straps to the vent pipe.
F. Change vent direction to horizontal/
inclined run—At transition from or to a
horizontal/inclined run, install the SV4.5E45
and SV4.5E90 elbows in the same manner as
the straight vent sections. The elbows feature
a twist section to allow them to be routed
about the center axis of their initial collar
section to align with the required direction
of the next vent run element. Twist elbow
sections in a clockwise direction only so as
to avoid the possibility of unlocking any of
the previously connected vent sections (see
Figures 13 and 15).
Swivel Joint
(360° swivel)
SV4.5E45
45° Elbow)
Figure 15: Vent Elbow Sections
G. Continue installation of horizontal/
inclined sections—Continue with the
installation of the straight vent sections in
horizontal/inclined run as described in Step
C. Install support straps every three feet
(914 mm) along horizontal/inclined vent runs
using conventional plumber's tape (Figure 16
on Page 15).
NOTE: Maintain the horizontal/inclined
run in a straight, slightly elevated plane—
approximately 1/4 in. per foot (20 mm
per meter)—in a direction away from
Blocking
the fireplace. Smaller rise per foot run
ratios are acceptable, down to at or near
Support Straps
level. Use a carpenter's level to measure
(Plumber's
tape)
from a constant surface and adjust the
support straps as necessary.
NOTE: Maintain the required clearances to
8 ft (2.4 m)
combustibles: 1 in. (25 mm) at all sides
Maximum
for all vertical runs; and 3 in. (76 mm) at
the top, 1 in. (25 mm) at sides, and 1 in.
(25 mm) at the bottom for all horizontal/
1/2 in. (13 mm)
inclined runs.
minimum
clearance to
combustibles
8 1/8 in.
4 13/16 in.
(206 mm)
(122 mm)
Swivel Joint
(360° swivel)
SV4.5E90
90° Elbow)
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