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VERTICAL TERMINATION SYSTEMS (ROOF)
See Figure 15 and Figures 27 to 31 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 summarizes 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. In the USA, the minimum
vent height above the roof and/or adjacent walls
is specified in ANSI Z223.1 (latest edition); in
Canada, by the current CAN-1 B149 installation
code. It is also specified in major building codes.
Always consult your local codes for specific
requirements. A general guide to follow is the
Gas Vent Rule (refer to Figure 4 on Page 5).
Vertical (Straight) Installation
Determine the number of straight vent sec-
tions 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 available (see Table 10 and Page 34 - Item
3). 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-
Termination
40 ft. Max.
SV4.5L6 / 2 / 24 / 36 / 48
(2.2 M)
Flex use Firestop / spacer
Figure 15
2
Nominal
Section Length
(inches)
N
S
e
i t c
Net Section
i (
Length (inches)
N
t e
e L
g n
Height of Vent
H
e
g i
*inches
n i
h c
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 .
SV4.5FA or SV4.5FB
1 8
Flashing and SV4.5SC
0 9
Storm Collar
1 9
5 .
3 9
6 9
7 9
5 .
" (25.4 mm)
Minimum
1
2 0
Clearance to
1
3 0
Combustibles
1
8 0
1
4 1
u
SV4.5VF
1
7 1
Firestop / spacer
1
8 1
1
6 2
1
0 3
1
5 3
1
8 3
Vent Sections
1
9 3
1
2 4
u
When using Secure
Table 9a
SF4.5VF
See Figure 21 & 22
for "support strap"
requirements
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
VENT SECTION LENGTH CHART
6
2
24
36
V
E
N
T
S
E
C
T
O I
N
E L
N
G
T
H
C
H
A
o
m
n i
l a
n o
e L
g n
h t
6
2
4 2
6 3
4 ½
0 ½
22 ½
34 ½
c n
e h
) s
S
e
i t c
n o
4
-
2 /
0
-
2 /
2 2
-
2 /
4 3
-
h t
i (
c n
e h
) s
Number of Vent Sections
t h
f o
V
e
t n
N
u
m
b
r e
f o
V
e
t n
S
e
t c
feet
s e
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
5 .
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
5 .
9
8 .
5 7
1
1
0
3
0 1
5 .
0
0
1
3
5 .
0 1
8 .
5 7
1
0
1
3
1
. 1
5 2
0
0
6
0
1 1
5 .
0
0
0
4
5 .
1 1
6 .
5 2
0
0
0
0
5 .
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
Length (inches)
R
T
O
N
o
m
n i
l a
S
e
i t c
n o
6
T
e L
g n
h t
i (
c n
e h
) s
T
Net Section
4 ½
A
8 4
O
N
t e
S
e
i t c
n o
Length (inches)
46
4
-
2 /
L
T
e L
g n
h t
i (
c n
e h
) s
½
A
Height of Vent
2 /
6 4
-
2 /
H
e
g i
t h
f o
V
e
t n
L
Q
T
o i
s n
*inches
feet
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
1
0 9
5 .
5 1
8 .
5 7
1
0
3
1
6 9
5 .
6 1
3 .
5 7
0
0
1
2
5 0
5 .
7 1
1 .
5 2
0
0
3
2
7 0
1
. 7
5 2
0
0
3
2
1 1
5 .
7 1
6 .
5 2
1
0
2
2
7 1
5 .
8 1
1 .
5 2
0
1
1
2
9 2
5 .
9 1
1 .
5 2
0
0
3
2
2 3
5 .
9 1
3 .
5 7
0
1
2
2
7 3
1
. 9
5 7
1
0
3
2
1 4
5 .
0 2
1 .
5 2
0
0
2
2
6 4
0 2
5 .
1
0
4
2
2 5
1 2
0
0
3
2
4 6
2 2
0
0
2
2
6 7
3 2
0
0
4
2
9 7
2
. 3
5 2
0
0
3
2
0 8
5 .
3 2
3 .
5 7
1
0
3
2
3 8
5 .
3 2
6 .
5 2
1
2
9 8
5 .
4 2
1 .
5 2
0
1
2
3
1 0
5 .
5 2
1 .
5 2
0
1
4
3
0 1
5 .
5 2
8 .
5 7
0
1
3
3
5 1
6 2
5 .
1
2
2
3
5 2
5 .
7 2
1 .
5 2
0
0
4
3
0 3
7 2
5 .
1
2
3
3
6 3
8 2
0
2
4
3
5 4
2
. 8
5 7
0
0
3
3
9 4
5 .
9 2
1 .
5 2
1
0
4
3
2 7
1 3
0
2
4
3
6 7
5 .
1 3
3 .
5 7
1
0
6
3
9 7
5 .
1 3
6 .
5 2
0
0
5
4
8 1
5 .
4 3
8 .
5 7
0
0
4
4
3 2
3
. 5
5 2
1
0
5
4
5 6
3
. 8
5 7
0
0
6
Table 9b
0
4
3
3
Effective Vent Length
0
5
Model
SV4.5L6
SV4.5L2
SV4.5L24
SV4.5L36
SV4.5L48
Table 10
2
24
36
48
T
T
O I
N
E L
N
G
T
H
C
H
A
R
T
O
T
T
2
4 2
6 3
8 4
O
0 ½
22 ½
34 ½
46 ½
A
T
L
A
0
-
2 /
2 2
-
2 /
4 3
-
2 /
6 4
-
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-/2"
0-/2"
22-/2"
34-/2"
46-/2"
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