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Vertical (Offset) Installation
Analyze the vent routing and determine the
quantities of vent sections and number of elbows
required. Refer to Vertical Vent Figures and
Tables on Pages 17 and 18 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 13 for an
aid in selecting length combinations. Elbows are
available in 90° and 45° configurations. Refer
to Figure 25 on Page 15 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 20).
10-1/2" Min.
Roof
(267 mm)
Framing
Ceiling
Framing
Figure 20
14
B. Attach vent components to appliance
- Secure Vent SV4.5 direct-vent system compo-
nents are unitized concentric pipe components
featuring positive twist lock connections (see
Figure 21). 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 cre-
ate the positive twist lock connection.
Arrow
Appliance Collar or
Vent Section
Figure 21
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 21). 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 chan-
nels. 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 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
10-1/2" Min.
(267 mm)
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.
Plumb
Bob
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
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
Arrow
Sections
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 lock-
ing 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 21.
D1. Install firestop/spacer at ceiling between
stories - Install a firestop/spacer (catalog no.
H2247 - Secure Vent; catalog no.H2249 - Secure
Flex) at the bottom side of the ceiling to the ceil-
ing joists. Route the vent sections through the
framed opening and secure the firestop/spacer
with appropriate fasteners at each corner.
Remember to maintain 1" (25 mm) clear-
ance between vertical chimney sections and
combustibles, framing members, and attic or
ceiling insulation.
D2. Install firestop thimble at the ceiling to
roof location - Position appropriate firestop
thimble (see Table on Page 35) at the bottom
side of ceiling and secure temporarily with
two appropriate fasteners. Attach permanently,
using at least two more fasteners, after vent sec-
tions have been assembled through the firestop
thimble and after any necessary adjustments
have been made.
Ensure the thimble penetrates the roof opening.
The thimble must extend completely through the
ceiling or roof cavity to the outermost plane of
the roof. Use thimble extension SVTE26 when
the distance between the outside of the roof and
the inside of the ceiling exceeds the height of
the firestop thimble. The thimble provides for
zero clearances to combustibles and must be
used at the ceiling/roof in manufactured homes
with Secure Vent double wall vent sections.
Maintain 1 in. (25.4 mm) clearance between
the thimble and the outer pipe of the secure
vent chimney system. See Figure 22 (Page 15)
for pitched roofs or flat roofs with flat ceilings
or Figure 23 (Page 15) for pitched roofs with
cathedral ceilings.
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