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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
14
Figure 18
SV4.5CGV-1
Termination
SV4.5FA or SV4.5FB
Flashing and SV4.5SC
Storm Collar
1” (25.4 mm)
Minimum
Clearance to
Combustibles
-1 ptSV4.5VF
Firestop / spacer
SV4.5L6 / 12 / 24 / 36 / 48
Vent Sections
When using Secure
Flex use Firestop / spacer
SF4.5VF
40 ft. Max.
(12.2 M)
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 9a
Table 9b
See Figure 21
for "support strap"
requirements
* 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 10
VERTICAL TERMINATION SYSTEMS (ROOF)
See Figure 18 and Figures 27 to 31 and their
associated Vertical Vent Tables illustrate the
vertical venting confi gurations that are allowed
to be used with these appliances. Secure Vent
pipe applications are shown in these fi gures;
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 specifi ed in ANSI Z223.1 (latest edition); in
Canada, by the current CAN-1 B149 installation
code. It is also specifi ed in major building codes.
Always consult your local 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 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 31 - Item
3). Plan the vent lengths so that a section joint
does not occur within the space defi ned by
ceiling joists or roof rafters. Refer to the Vent
Section Length Chart.