Vertical Termination Systems; Vent Section Length Chart - Superior SSDVT-4035CNM Installation Instructions Manual
Direct vent gas fireplace heaters
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VERTICAL TERMINATION SYSTEMS (ROOF)
Figure 21 (Page 15), and Figures 26 to
30 (Pages 17 and 18) and their associated
Vertical Vent Tables illustrate the various verti-
cal venting confi gurations that are possible for
use with these appliances. Secure Vent pipe
applications are shown in these Figures; Secure
Flex pipe may also be used. 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. The minimum vent height
above the roof and/or adjacent walls is speci-
fi ed in ANSI Z223.1-(latest edition) (In Canada,
the current CAN-1 B149 installation code) by
major building codes. Always consult your lo-
cal codes for specifi c requirements. A general
guide to follow is the Gas Vent Rule (refer to
Figure 5 on Page 7).
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 available
(see Table 11 and Page 33 - Item 3). Plan the
vent lengths so that a joint does not occur at
the intersection of ceiling or roof joists. Refer
to the Vent Section Length Chart.
Figure 18
14
VENT SECTION LENGTH CHART
Nominal
6
12
24
Section Length
(inches)
Net Section
4 ½
10 ½
22 ½
Length (inches)
Height of Vent
Number of Vent Sections
*inches
feet
4
5 .
0
3 .
5 7
1
0
0
9
. 0
5 7
2
0
0
0 1
5 .
0
8 .
5 7
0
1
0
5 1
. 1
5 2
1
1
0
9 1
5 .
1
6 .
5 2
2
1
0
1 2
. 1
5 7
0
2
0
2 2
5 .
1
8 .
5 7
0
0
1
5 2
5 .
2
1 .
5 2
1
2
0
1 3
5 .
2
6 .
5 2
0
3
0
4 3
5 .
2
8 .
5 7
0
0
0
7 3
5 .
3
1 .
5 2
1
1
1
3 4
5 .
3
6 .
5 2
0
2
1
5 4
. 3
5 7
0
0
2
6 4
5 .
3
8 .
5 7
0
0
0
9 4
5 .
4
1 .
5 2
1
0
2
1 5
. 4
5 2
1
0
0
5 5
5 .
4
6 .
5 2
0
1
2
7 5
. 4
5 7
0
0
1
6 6
. 5
5 2
0
2
2
7 6
5 .
5
6 .
5 2
0
0
3
9 6
. 5
5 7
0
0
0
2 7
6
1
0
3
3 7
5 .
6
1 .
5 2
1
0
0
9 7
5 .
6
6 .
5 2
0
1
0
1 8
. 6
5 7
0
0
0
0 9
7
5 .
0
2
1
1 9
5 .
7
6 .
5 2
0
0
2
3 9
. 7
5 7
0
0
0
6 9
8
1
0
1
7 9
5 .
8
1 .
5 2
1
0
0
1
2 0
8
5 .
2
0
0
1
3 0
5 .
8
6 .
5 2
0
0
0
1
8 0
9
1
0
0
1
4 1
9
5 .
0
2
0
1
7 1
. 9
5 7
1
0
5
1
8 1
5 .
9
8 .
5 7
1
1
0
1
6 2
0 1
5 .
0
0
1
1
0 3
5 .
0 1
8 .
5 7
1
0
1
1
5 3
1
. 1
5 2
0
0
6
1
8 3
1 1
5 .
0
0
0
1
9 3
5 .
1 1
6 .
5 2
0
0
0
1
2 4
5 .
1 1
8 .
5 7
1
0
0
Table 10a
* 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
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
VENT SECTION LENGTH CHART
36
48
Nominal Section
T
Length (inches)
O
T
Net Section
A
Length (inches)
34 ½
46
L
½
Height of Vent
Q
T
*inches
feet
Y
1
4 4
2 1
0
0
1
1
0 5
2 1
5 .
0
0
2
1
4 5
5 .
2 1
8 .
5 7
0
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
0
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
0
0
3
1
6 9
5 .
6 1
3 .
5 7
1
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
0
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
0
0
3
2
1 4
5 .
0 2
1 .
5 2
1
0
2
2
6 4
0 2
5 .
0
0
4
2
2 5
1 2
0
0
3
2
4 6
2 2
2
0
2
2
6 7
3 2
0
0
4
2
9 7
2
. 3
5 2
2
0
3
2
0 8
5 .
3 2
3 .
5 7
2
0
3
2
3 8
5 .
3 2
6 .
5 2
1
1
2
2
9 8
5 .
4 2
1 .
5 2
0
1
4
3
1 0
5 .
5 2
1 .
5 2
0
1
3
3
0 1
5 .
5 2
8 .
5 7
3
5 1
6 2
5 .
0
2
2
3
5 2
5 .
7 2
1 .
5 2
2
0
4
3
0 3
7 2
5 .
0
2
3
3
6 3
8 2
0
2
4
3
5 4
2
. 8
5 7
3
0
3
3
9 4
5 .
9 2
1 .
5 2
3
0
4
3
2 7
1 3
0
2
4
3
6 7
5 .
1 3
3 .
5 7
0
0
6
3
9 7
5 .
1 3
6 .
5 2
3
0
5
4
8 1
5 .
4 3
8 .
5 7
3
0
4
4
3 2
3
. 5
5 2
3
0
5
4
5 6
3
. 8
5 7
0
0
6
Table 10b
4
0
4
0
3
3
4
0
5
Effective Vent Length
Model
SV4.5L6
SV4.5L12
SV4.5L24
SV4.5L36
SV4.5L48
Table 11
T
6
12
24
36
48
O
T
A
4 ½
10 ½
22 ½
34 ½
46 ½
L
Number of Vent Sections
Q
T
Y
1
0
0
0
3
4
0
1
0
0
3
4
1
1
0
0
3
5
0
2
0
0
3
5
0
0
0
5
0
5
1
0
0
5
0
6
0
1
0
5
0
6
0
0
0
0
4
4
1
0
0
0
4
5
0
1
0
0
4
5
0
1
1
5
0
7
0
0
0
6
0
6
1
0
0
6
0
7
0
1
0
6
0
7
0
0
1
6
0
7
0
0
0
0
5
5
1
0
0
0
5
6
0
0
0
7
0
7
1
0
0
7
0
8
0
1
0
7
0
8
0
0
1
7
0
8
0
0
0
8
0
8
0
0
0
0
6
6
1
0
0
8
0
9
1
0
0
0
6
7
0
1
0
0
6
7
0
0
1
0
6
7
0
0
0
9
0
9
1
0
0
9
0
0 1
0
0
0
0
7
7
1
0
0
0
7
8
0
1
0
0
7
8
0
0
0
0 1
0
0 1
1
0
0
0 1
0
1 1
0
0
0
0
8
8
1
0
0
0
8
9
0
0
0
1 1
0
1 1
0
0
0
0
9
9
1
0
0
0
9
0 1
0
0
0
0
0 1
0 1
Effective Length
4-1/2"
10-1/2"
22-1/2"
34-1/2"
46-1/2"
1 4
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