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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, 10¹⁄₂" x 10¹⁄₂" (267mm x
267mm) inside dimensions, about this cen-
ter mark ( Figure 18 ).
10¹⁄₂" Min.
(267 mm)
f i r e - p a r t s . c o m
Figure 18
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 19) . All of the appliances
covered in this document are fitted with col-
lars having locking inclined channels. The
dimpled end of the vent components fit over
the appliance collar to create the positive twist
lock connection.
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.
Dimple
Locking
Incline Channel
Appliance collar
Vent / Appliance Collar
Connection
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 23) . 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.
Arrow
Locking
Incline Channel
Arrow
Figure 20
The unitized design of the Secure Vent com-
ponents will engage and seal both the inner and
outer pipe elements with the same procedure.
Sealant and securing screws are not required.
C. Attach vent components to each other -
Other vent sections may be added to the previ-
10¹⁄₂" Min.
ously installed section in accordance with the
(267 mm)
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 in-
stalled 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 en-
gages, 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.
D1. Install firestop/spacer at ceiling between
stories - Install a firestop/spacer (catalog no.
96K87 - Secure Vent; catalog no.19M41 -
Secure Flex) at the bottom side of the ceiling to
the ceiling 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) clearance
between vertical chimney sections and com-
bustibles, framing members, and attic or
ceiling insulation.
D2. Install firestop thimble at the ceiling to
roof location - Position appropriate firestop
thimble (see thimble table on page 24) at the
bottom side of ceiling and secure temporarily
with two appropriate fasteners. Attach perma-
nently, using at least two more fasteners, after
vent sections have been assembled through
the firestop thimble and after any necessary
adjustments have been made.
NOTE: DIAGRAMS & ILLUSTRATIONS 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. Twist vent
component clockwise to engage and
seal until arrow and dimple align.
Dimple
Connected
Arrow
Vent Sections
Vent / Vent Section
Connection
Ensure the thimble penetrates the roof open-
ing. The thimble must extend completely
through the ceiling or roof cavity to the outer-
most 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 manu-
factured homes with Secure Vent double wall
vent sections. Maintain 1 in. (25.4 mm) clear-
ance between the thimble and the outer pipe
of the secure vent chimney system. See Fig-
ure 21 for pitched roofs or flat roofs with flat
ceilings or Figure 22 for pitched roofs with
cathedral ceilings.
Outer Pipe Of
Chimney
14" Min.
Firestop
Thimble
Pitched Roof
Note: Trim Thimble/
Extension To Desired Length
And Pitch At The Roof Line
14" Min.
Thimble
Extension
SV-FSTFE
Firestop
Thimble
Pitched Roof
Outer Pipe Of
14" Min.
Chimney
Firestop
Thimble
Bow Roof
FIGURE 21
Outer Pipe Of
Chimney
14" Min.
Use correct firestop
thimble depending on the
pitch of the interior
Note: Regular Thimble
(SV-FSTFE) Can Be Used
If A Header Is Constructed
FIGURE 22
Outer Pipe Of
Chimney
13"
ceiling.
At This Point
11
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