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
uSV4.5VF
Firestop / spacer
SV4.5L6 / 12 / 24 / 36 / 48
Vent Sections
uWhen using Secure
Flex use Firestop / spacer
SF4.5VF
40 ft. Max.
(12.2 M)
TRAHCHTGNELNOITCESTNEV
noitceSlanimoN )sehcni(htgneL 621426384T
O
T
A
L
Q
T
Y
noitceSteN )sehcni(htgneL 2/1-42/1-012/1-222/1-432/1-64
tneVfothgieHsnoitceStneVforebmuN
sehcnitf
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
54357.82000 01001
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) 612 24 36 48Net Section Length (inches) 4 ½ 10 ½ 22 ½ 34 ½ 46 ½Height of Vent Number of Vent Sections
*inches feet
T
O
T
ALQ
T
Y
TRAHCHTGNELNOITCESTNEV
lanimoN htgneLnoitceS )sehcni( 621426384T
O
T
A
L
Q
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noitceSteN )sehcni(htgneL 2/1-42/1-012/1-222/1-432/1-64
tneVfothgieHsnoitceStneVforebmuN
sehcnitf
5.4573.0100001
957.0200002
5.01578.0010001
5152.1110002
5.91526.1210003
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
276103004
5.37521.6100203
5.97526.6010203
1857.6000112
095.7021014
5.
19526.7002013
3957.7000022
698101204
5.79521.8100023
2015.8200024
5.301526.8000303
8019100304
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)612 24 36 48Net Section Length (inches) 4 ½ 10 ½ 22 ½ 34 ½ 46 ½Height of Vent Number of Vent Sections
*inches feet
T
O
T
A
L
Q
T
Y
See Figure 21 (Page
15) 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 8

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.