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VERTICAL TERMINATION SYSTEMS (ROOF)
See Figure 18 and Figures 27 to 31 (Pages 17
and 18) and their associated Vertical Vent Tables
illustrate the vertical venting configurations that
are allowed to be used with these appliances.
Secure Vent™ pipe applications are shown in
these figures; Secure Flex™ pipe may also be
used. See Page 24. A Vertical Vent Table sum-
marizes each system's minimum and maximum
vertical and horizontal length values that can be
used to design and install the vent components
in a variety of applications.
Both these vertical vent systems terminate
through the roof. The minimum vent height
above the roof and/or adjacent walls is speci-
fied in ANSI Z223.1-(latest edition) (In Canada,
the current CAN/CSA-B149.1 installation code)
by major building codes. Always consult your
local codes for specific requirements. A general
guide to follow is the Gas Vent Rule (refer to
Figure 4B on Page 6).
A vent restrictor will need to be installed when
vertical termination is used. See Installation of
Vent Restrictor on Page 13 for guidelines.
Vertical (Straight) Installation
Determine the number of straight vent sections
required. 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) net section lengths are avail-
able (see Table 8 and Page 33 - Item 3). It is
recommended that you plan the vent lengths
so that a section joint does not occur within the
space defined by ceiling joists or roof rafters.
Refer to the Vent Section Length Chart.
SV4.5CGV-1
Termination
40 ft. Max.
SV4.5L6 / 12 / 24 / 36 / 48
(12.2 M)
u
Flex use Firestop / spacer
Figure 18
14
Nominal
Section Length
(inches)
N
o
S
e
i t c
n o
Net Section
i (
c n
Length (inches)
N
t e
e L
g n
h t
Height of Vent
H
e
g i
t h
*inches
n i
h c
s e
4
5 .
9
0 1
5 .
5 1
9 1
5 .
1 2
2 2
5 .
5 2
5 .
1 3
5 .
4 3
5 .
7 3
5 .
3 4
5 .
5 4
6 4
5 .
9 4
5 .
1 5
5 5
5 .
7 5
6 6
7 6
5 .
9 6
2 7
3 7
5 .
9 7
5 .
1 8
0 9
1 9
5 .
SV4.5FA or SV4.5FB
Flashing and SV4.5SC
3 9
Storm Collar
6 9
7 9
5 .
1
2 0
1
3 0
5 .
1
8 0
1" (25.4 mm)
1
4 1
Minimum
Clearance to
1
7 1
Combustibles
1
8 1
5 .
1
6 2
u
SV4.5VF
1
0 3
5 .
Firestop / spacer
1
5 3
1
8 3
1
9 3
5 .
1
2 4
5 .
Vent Sections
When using Secure
SF4.5VF
See Figure 21 (Page
15) for "support strap"
requirements
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
VENT SECTION LENGTH CHART
6
12
24
36
V
E
N
T
S
E
C
T
O I
N
E L
N
G
T
H
C
H
A
R
m
n i
l a
e L
g n
h t
6
2 1
4 2
6 3
4 ½
10 ½
22 ½
34 ½
e h
) s
S
e
i t c
n o
4
1 -
2 /
0 1
1 -
2 /
2 2
1 -
2 /
4 3
1 -
2 /
i (
c n
e h
) s
Number of Vent Sections
f o
V
e
t n
N
u
m
b
r e
f o
V
e
t n
S
e
t c
o i
feet
t f
0
3 .
5 7
1
0
0
0
. 0
5 7
2
0
0
0
0
8 .
5 7
0
1
0
0
. 1
5 2
1
1
0
0
1
6 .
5 2
2
1
0
0
. 1
5 7
0
2
0
0
1
8 .
5 7
0
0
1
0
2
1 .
5 2
1
2
0
0
2
6 .
5 2
0
3
0
0
2
8 .
5 7
0
0
0
1
3
1 .
5 2
1
1
1
0
3
6 .
5 2
0
2
1
0
. 3
5 7
0
0
2
0
3
8 .
5 7
0
0
0
0
4
1 .
5 2
1
0
2
0
. 4
5 2
1
0
0
0
4
6 .
5 2
0
1
2
0
. 4
5 7
0
0
1
1
. 5
5 2
0
2
2
0
5
6 .
5 2
0
0
3
0
. 5
5 7
0
0
0
2
6
1
0
3
0
6
1 .
5 2
1
0
0
2
6
6 .
5 2
0
1
0
2
. 6
5 7
0
0
0
1
7
5 .
0
2
1
0
7
6 .
5 2
0
0
2
0
. 7
5 7
0
0
0
0
8
1
0
1
2
8
1 .
5 2
1
0
0
0
8
5 .
2
0
0
0
8
6 .
5 2
0
0
0
3
9
1
0
0
3
9
5 .
0
2
0
0
. 9
5 7
1
0
5
0
9
8 .
5 7
1
1
0
3
0 1
5 .
0
0
1
3
0 1
8 .
5 7
1
0
1
3
1
. 1
5 2
0
0
6
0
1 1
5 .
0
0
0
4
1 1
6 .
5 2
0
0
0
0
1 1
8 .
5 7
1
0
0
4
* Convert inches into metric equiva-
lent measure, as follows:
Millimeters (mm) = Inches x 25.4
Centimeters (cm) = Inches x 2.54
Meters (M) = Inches x .0254
VENT SECTION LENGTH CHART
48
Nominal Section
6
V
E
N
T
S
E
C
T
T
Length (inches)
O
N
o
m
n i
l a
S
e
i t c
n o
T
6
T
e L
g n
h t
i (
c n
e h
) s
Net Section
4 ½
T
A
N
t e
S
e
i t c
n o
8 4
Length (inches)
O
46
L
4
1 -
2 /
e L
g n
h t
i (
c n
e h
) s
T
½
A
Height of Vent
H
e
g i
t h
f o
V
e
t n
6 4
1 -
2 /
Q
L
T
*inches
feet
s n
n i
h c
s e
t f
Q
Y
T
1
4 4
2 1
1
Y
0
1
1
0 5
2 1
5 .
0
0
2
1
4 5
5 .
2 1
8 .
5 7
1
0
1
1
0 6
5 .
3 1
3 .
5 7
0
0
2
1
2 7
5 .
4 1
3 .
5 7
0
0
3
1
7 7
1
. 4
5 7
1
0
2
1
3 8
1
. 5
5 2
0
0
1
1
6 8
5 1
5 .
0
0
3
0
3
1
0 9
5 .
5 1
8 .
5 7
1
0
1
1
6 9
5 .
6 1
3 .
5 7
0
0
3
2
5 0
5 .
7 1
1 .
5 2
0
0
3
2
7 0
1
. 7
5 2
0
0
2
2
1 1
5 .
7 1
6 .
5 2
1
1
1
2
7 1
5 .
8 1
1 .
5 2
0
0
3
2
9 2
5 .
9 1
1 .
5 2
0
1
2
2
2 3
5 .
9 1
3 .
5 7
0
0
3
2
7 3
1
. 9
5 7
1
0
2
2
1 4
5 .
0 2
1 .
5 2
0
0
4
2
6 4
0 2
5 .
1
0
3
2
2 5
1 2
0
0
2
2
4 6
2 2
0
0
4
2
6 7
3 2
0
0
3
2
9 7
2
. 3
5 2
0
0
3
2
0 8
5 .
3 2
3 .
5 7
1
1
2
2
3 8
5 .
3 2
6 .
5 2
1
1
4
2
9 8
5 .
4 2
1 .
5 2
0
1
3
3
1 0
5 .
5 2
1 .
5 2
0
2
2
3
0 1
5 .
5 2
8 .
5 7
0
0
4
3
5 1
6 2
5 .
1
2
3
3
5 2
5 .
7 2
1 .
5 2
0
2
4
3
0 3
7 2
5 .
1
0
3
3
6 3
8 2
0
0
4
3
5 4
2
. 8
5 7
0
2
4
3
9 4
5 .
9 2
1 .
5 2
1
0
6
3
2 7
1 3
0
0
5
3
6 7
5 .
1 3
3 .
5 7
1
0
4
3
9 7
5 .
1 3
6 .
5 2
0
0
5
4
8 1
5 .
4 3
8 .
5 7
0
0
6
4
3 2
3
. 5
5 2
1
0
4
4
5 6
3
. 8
5 7
0
3
3
0
5
Effective Vent Length
Model
SV4.5L6
SV4.5L12
SV4.5L24
SV4.5L36
SV4.5L48
Table 8
T
12
24
36
48
O I
N
E L
N
G
T
H
C
H
A
R
T
O
T
T
2 1
4 2
6 3
8 4
O
A
10 ½
22 ½
34 ½
46 ½
T
L
A
0 1
1 -
2 /
2 2
1 -
2 /
4 3
1 -
2 /
6 4
1 -
2 /
L
Number of Vent Sections
Q
N
u
m
b
r e
f o
V
e
t n
S
e
t c
o i
s n
Q
T
T
Y
Y
0
0
0
3
4
1
0
0
3
4
1
0
0
3
5
2
0
0
3
5
0
0
5
0
5
0
0
5
0
6
1
0
5
0
6
0
0
0
4
4
0
0
0
4
5
1
0
0
4
5
1
1
5
0
7
0
0
6
0
6
0
0
6
0
7
1
0
6
0
7
0
1
6
0
7
0
0
0
5
5
0
0
0
5
6
0
0
7
0
7
0
0
7
0
8
1
0
7
0
8
0
1
7
0
8
0
0
8
0
8
0
0
0
6
6
0
0
8
0
9
0
0
0
6
7
1
0
0
6
7
0
1
0
6
7
0
0
9
0
9
0
0
9
0
0 1
0
0
0
7
7
0
0
0
7
8
1
0
0
7
8
0
0
0 1
0
0 1
0
0
0 1
0
1 1
0
0
0
8
8
0
0
0
8
9
0
0
1 1
0
1 1
0
0
0
9
9
0
0
0
9
0 1
0
0
0
0 1
0 1
Effective Length
4-1/2"
10-1/2"
22-1/2"
34-1/2"
46-1/2"
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