Lennox ENVY Installation Instructions Manual page 18

LENNOX HEARTH PRODUCTS • SIGNATURE
Horizontal (Outside Wall)
Termination System
See the horizontal vent tables on Page 20
that illustrate the various horizontal venting
configurations that are possible for use
with these appliances. Secure Vent™ pipe
applications are shown in these figures;
Secure Flex™ pipe may also be used. The
tables summarize each system's minimum
and maximum vertical and horizontal
lengths for installing the vent components
in a variety of applications.
These horizontal vent systems terminate
through an outside wall. Building codes
limit or prohibit terminating in specific areas
(Table 6).
Secure Vent SV4.5 direct-vent system
components are unitized concentric pipe
components featuring positive twist
lock connections (Figure 16). All of the
appliances covered in this document are
fitted with collars having locking inclined
channels. The dimpled end of the vent
components fit over the appliance collar to
create the positive twist lock connection.
1. Plan the vent run—Analyze the vent
f i r e - p a r t s . c o m
routing and determine the types and
quantities of sections required: 4 1/2 in.
(114 mm), 10 1/2 in. (267 mm),
22 1/2 in. (572 mm), 34 1/2 in.
(876 mm) and 46 1/2 in. (1181 mm)
net section lengths are available. Plan
the vent lengths so that a joint does
not occur at the intersection of ceiling
or roof joists. Make allowances for
elbows. Maintain a minimum 1 in.
(25 mm) clearance to combustibles on
the vertical sections. Clearances for the
horizontal runs are 3 in. (76 mm) on
top, 1 in. (25 mm) on sides, and 1 in.
(25 mm) at the bottom.
2. Frame exterior wall opening—Locate
the center of the vent outlet on
the exterior wall according to the
dimensions shown in (Figure 23).
Cut and/or frame an opening, 10 1/2
x 12 1/8 in. (267 x 308 mm) inside
dimensions, about this center.
3. Frame ceiling opening—If the vertical
route will penetrate a ceiling, use
a plumb line to locate the center
above the appliance. Cut and/or
frame an opening, 10 1/2 x 10 1/2 in.
(267 x 267 mm) inside dimensions,
about this center (Table 15).
4. Attach vent components to appliance—
To attach a vent component to the
appliance collar, align the dimpled
end over the collar, adjusting the
radial alignment until the four locking
dimples are aligned with the inlets of
the four incline channels on the collar
(Figure 16). 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.
18
SERIES DIRECT-VENT GAS FIREPLACES • ENVY/ENVY CD 35/40/45 • INSTALLATION INSTRUCTIONS
®
Slide the rope gasket over the vent
component and position it snugly
against the apppliance.
The unitized design of 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.
NOTE: An elbow may not be attached
directly to the appliance collar. At a
minimum, a 12 in. (305 mm) straight
vent section is required before
attaching the first elbow (Figure 22).
5. Attach vent components to each
other—Other vent sections may be
added to the previously 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 (Figure 16).
6. 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.
NOTE: Maintain 1 in. (25 mm) clearance
to combustibles, framing members, and
attic or ceiling insulation when running
vertical chimney sections.
7. Support the vertical run sections—
See Page 15.
8. Change vent direction—At transition to/
from 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
DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
direction only, to avoid the possibility
of unlocking any of the previously
connected vent sections (Figure 16).
9. Continue installation of horizontal/
inclined sections—Continue with the
installation of the straight vent sections
in horizontal/inclined run. Install
support straps every 5 ft (1.52 m)
along horizontal/inclined vent runs
using conventional plumber's tape
(Figure 22). Maintain the horizontal/
inclined run in a straight (no dips) and
slightly elevated plane, in a direction
away from the fireplace of 1/4 in. rise
per foot (20 mm per meter). Smaller
rise per foot run ratios are acceptable,
all the way down to at/near level.
NOTE: Maintain the required clearances
to combustibles: 1 in. (25 mm) at all
sides 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/inclined runs. Use a
carpenter's level to measure from a
constant surface and adjust the support
straps as necessary.
10. Assemble the vent run to the exterior
wall—If not previously measured,
locate the center of the vent at the
exterior wall. Prepare an opening as
described in Figure 23. Assemble
the vent system to point where the
terminus of the last section is located
relative to the exterior surface to
which the termination is to be attached
(Figure 24). 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 those shown
in Figure 24, refer to Table 18.
11. Attach the termination adaptor—Attach
the adaptor (SV4.5RCH, provided with
the termination) to the vent section
or telescoping vent section elbow or
appliance collar (Figure 23) in the same
manner as any SV4.5 vent component.
12. Install the firestop/spacer at the exterior
wall—When using the termination,
install the SV4.5HF (Secure Vent™), or
SF4.5HF (Secure Flex™) firestop/spacer
over the opening at the exterior side of
the framing, long side up, with the 3 in.
spacer clearance at the top (Figure 23),
and nail into place. The firestop/spacer
may also be installed over the opening
at the interior side of framing.
NOTE: The firestop/spacer also may
be installed over the opening on the
interior side of framing. The gap
between the vent pipe and a firestop
can be sealed with noncombustible
caulking.