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NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
Figure 20
To add another vent component to a length 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 19.
D. 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. Remember to maintain 1" (25 mm)
clearance to combustibles, framing mem-
bers, and attic or ceiling insulation when
running vertical chimney sections. Attic insu-
lation shield (96K94) may be used to obtain
the required clearances indicated here. See
installation accessories table on page 27.
E. Support the vertical vent run sections -
Note - Proper venting support is very impor-
tant. The weight of the vent must not be
supported by the firplace in any degree.
Support the vertical portion of the venting
system every 8 feet (2.4m) above the fireplace
vent outlet.
10-1/2” Min.
(267 mm)
10-1/2” Min.
(267 mm)
First Vent
Component
Align the dimple (four places)
with the opening of the locking
incline channel on appliance
collar. Twist vent component
clockwise to engage and seal.
Locking
Incline Channel
Dimple
Appliance collar
Vent / Appliance Collar
Connection
Align the dimple (four places) of the
upper vent section with the opening of
the locking incline channel on the
lower vent section. Twist vent
component clockwise to engage and
seal until arrow and dimple align.
Locking
Incline Channel
Dimple
Arrow
Connected
Vent Sections
Vent / Vent Section
Connection
Arrow
Arrow
Figure 17
Figure 19
Figure 18
All of the appliances covered in this document
are fitted with collars having locking inclined
channels. The dimpled end of the vent compo-
nents fit over the appliance collar to create the
positive twist lock connection.
Vertical (Offset) Installation
Analyze the vent routing and determine the quan-
tities of vent sections and number of elbows
required. Refer to Vertical Vent Figures and
Tables on page 14 and 15 to select the type of
vertical installation desired. Vent sections are
available in net lengths of 4-1/2" (114 mm), 10-
1/2" (267 mm), 22-1/2" (572 mm), 34-1/2" (876
mm) and 46-1/2" (1181 mm). Refer to the Vent
Section Length Chart on page 10 for an aid in
selecting length combinations. Elbows are avail-
able in 90° and 45° configurations. Refer to
Figure 21 on page 13
for the SV4.5E45 and
SV4.5E90 elbow dimensional specifications.
Where required, a telescopic vent section
(SV4.5LA) may be used to provide the installer
with an option in installing in tight and confined
spaces or where the vent run made up of fixed
length pieces develops a joint in a undesirable
location, or will not build up to the required length.
The SV4.5LA Telescopic Vent Section has an
effective length of from 1-1/2" (38 mm) to 7-1/2"
(191 mm). The SV4.5LA is fitted with a locking
inclined channel end (identical to a normal vent
section component) and a plain end with 3 pilot
holes. Slip the plain end over the locking channel
end of a standard SV4.5 vent component the
required distance and secure with three screws.
Maintain a minimum 1" (25 mm) clearance to
combustible materials for all vertical elements.
Clearances for all horizontal elements are 3"
(76 mm) on top, 1" (25 mm) on sides and 1"
(25 mm) on the bottom.
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" x 10-1/2" (267mm x 267mm)
inside dimensions, about this center mark
(
Figure 17
).
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 inlet of
the four inclined channels on the collar
(refer
to Figure 18 )
. 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 compo-
nents will engage and seal both the inner and
outer pipe without the need for sealant or
screws. If desired, a #6 x 1/2" screw may be
used at the joint, but is not required as the
pipe will securely lock when twisted.
Note: An elbow may also be attached to the
appliance collar. Attach in the same manner
as you would a vent section.
C. Attach vent components to each other - Other
vent sections may be added to the previously
installed section in accordance with the require-
ments of the vertical vent figures and tables.
B. Attach vent components to appliance -
Secure Vent SV4.5 direct vent system compo-
nents are unitized concentric pipe compo-
nents featuring positive twist lock connec-
tions (
see Figure 18
).
1 inch
(25.4 mm)
minimum
clearance to
combustibles
Support Straps
(Plumber’s tape)
8 feet (2.4 m)
Maximum
Blocking