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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
14
SV4.5CGV-1
Termination
SV4.5FA OR
SV4.5FB Flashing
AND SV4.5SC
STORM COLLAR
SV4.5VF
Firestop/Spacer
SV4
.5L6/12/24/36/48
V
ent Sections
40' Max
(12.2 M)
1" (25.4 mm)
Minimum
Clearance to
Combustibles
W
hen using Secure Flex
use
Firestop/Spacer
SF4.5VF
44121100034
0515.21010034
5.451578.21110035
5.061573.31020035
5.271573.41000505
77157.41100506
38152.51010506
6815.51000044
5.091578.51100045
5.691573.61010045
5.502521.71011507
70252.71000606
5.112526.71100607
5.712521.81010607
5.922521.91001607
5.232573.91000055
73257.91100056
5.142521.02000707
6425.02100708
25212010708
46222001708
67232000808
97252.32000066
5.082573.32100809
5.382526.32100067
5.982521.42010067
5.103521.52001067
5.013578.52000909
5135.621009001
5.523521.72000077
0335.72100078
63382010078
54357.8200001001
5.943521.9210001011
27313000088
5.673573.13100089
5.973526.1300011011
5.814578.43000099
32452.531000901
56457.8300000101
Vent Section Length Chart
Nominal Section
Length (inches)
612243648
Net Section
Length (inches)
4 ½ 10 ½ 22 ½ 34 ½ 46 ½
Height of Vent Number of Vent Sections
*inches feet
T
O
T
A
L
Q
T
Y
5.4573.0100001
957.0200002
5.01578.0010001
5152.1110002
5.91526.12100
0
3
1257.1020002
5.22578.1001001
5.52521.2120003
5.13526.2030003
5.43578.2000101
5.73521.3111003
5.34526.3021003
5457.3002002
5.64578.3000011
5.94521.4102003
1552.4100012
5.55526.4012003
7557.4001102
6652.5022004
5.76526.5003003
9657.5000202
27 6103004
5.37521.6100203
5.97526.6010203
1857.6000112
095.7021014
5.19526.7002013
3957.7000022
69 8101204
5.79521.8100023
2015.8200024
5.301526.8000303
801 9100304
4115.9020024
71157.9105006
5.811578.9110305
6215.01001304
5.031578.01101305
53152.11006006
8315.11000404
5.931526.11000033
5.241578.11100405
Vent Section Length Chart
Nominal
Section Length
(inches)
612243648
Net Section
Length (inches)
4 ½ 10 ½ 22 ½ 34 ½ 46
½
Height of Vent Number of Vent Sections
*inches feet
T
O
T
A
L
Q
T
Y
Table 10a
Table 10b
* 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
Effective Vent Length
Model Effective Length
SV4.5L6 4-1/2"
SV4.5L12 10-1/2"
SV4.5L24 22-1/2"
SV4.5L36 34-1/2"
SV4.5L48 46-1/2"
Table 11
Figure 18
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 4 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 32 - 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.