Figure 17, Table 7, Effective vent length – Superior MILLIVOLT SDVST-N-B User Manual
Page 14
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
14
Figure 17
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VENT SECTION LENGTH CHART
Nominal Section
Length (inches)
6
12
24
36
48
Net Section
Length (inches)
4 ½
10 ½
22 ½
34 ½
46 ½
Height of Vent
Number of Vent Sections
u
inch
feet
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VENT SECTION LENGTH CHART
Nominal
Section Length
(inches)
6
12
24
36
48
Net Section
Length (inches)
4 ½
10 ½
22 ½
34 ½
46
½
Height of Vent
Number of Vent Sections
u
inch
feet
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* 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 7
SV4.5CGV-1
Termination
SV4.5FA or SV4.5FB
Flashing and SV4.5SC
Storm Collar
1” (25.4 mm)
Minimum
Clearance to
Combustibles
u
SV4.5VF
Firestop / spacer
SV4.5L6 / 12 / 24 / 36 / 48
Vent Sections
u
When using Secure
Flex use Firestop / spacer
SF4.5VF
40 ft. Max.
(12.2 M)
See Figure 22 on Page
16 for "support strap"
requirements
VERTICAL TERMINATION SYSTEMS (ROOF)
See Figure 17 and Figures 28 to 32 (Pages 18
and 19) 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 25. 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 3B 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 7 and Page 34 - 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.