NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
15
Blocking
Support Straps
(Plumber's tape)
8 feet (2.4 m)
Maximum
1 inch (25.4
mm) minimum
clearance to
combustibles
Figure 19
Roof
Framing
Ceiling
Framing
Plumb
Bob
Figure 21
Another method, where the vent is not adjacent
to a wall, is illustrated in Figure 22 on Page
16. Here, support straps (96K93) and support
plates (96K92) can be used to support the
weight of the vent.
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 open-
ing 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 members, and attic or
ceiling insulation when running vertical chim-
ney sections. Attic insulation shield (H3907)
may be used to obtain the required clearances
indicated here. See installation accessories o
n Pages 33 and 34. The gap between the vent
pipe and a vertical firestop can be sealed with
non-combustible caulking.
E. Support the vertical vent run sections -
Note - Proper venting support is very important.
The weight of the vent must not be supported
by the fireplace in any degree.
Support the vertical portion of the venting system
every 8 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.
Loop the tape around the vent, securing the
ends of the tape to the framing. If desired,
sheet metal screws #6 x 1/2" length may be
used to secure the support straps to the vent
pipe. See Figure 21.
10-1/2" Min.
(267 mm)
10-1/2" Min.
(267 mm)
Figure 20
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 col-
lar. Twist vent component clockwise
to engage and seal until arrow and
dimple align.
Dimple
Locking Incline
Channel
Connected Vent
Sections Arrow
Arrow
Appliance Collar or
Vent Section
Vertical (offset) Installation
Analyze the vent routing and determine the
number of vent sections and elbows required.
Refer to Vertical Vent Figures and Tables on
Pages 17 and 18 to select the type of vertical
installation desired. Refer to the Vent Section
Length Charts on Page 14 for an aid in selecting
vent length combinations. Elbows are available
in 45° and 90° configurations. Refer to Figure
23 on Page 16 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 ele-
ments. 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" (267 mm x 267
mm) inside dimensions, about this center mark
(Figure 19).
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 20). 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
without the need for sealant or screws. If
desired a #6 x 1/2" screw may be used at the
joint, but it 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 requirements of the vertical vent Figures
and Tables. 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 20.
B. Attach vent components to appliance - Se-
cure Vent SV4.5 direct-vent system compo-
nents are unitized concentric pipe components
featuring positive twist lock connections (see
Figure 20).
All of the appliances covered in this document
are fitted with collars having locking inclined
channels. The dimpled end of the vent com-
ponents fit over the appliance collar to create
the positive twist lock connection.