Figure 19, Vertical termination systems (roof), Table 7 – Superior SDV35 User Manual
Page 13: Effective vent length
13
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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
*inches
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
*inches
feet
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Figure 19
SV4.5CG V- 1
T ermination
SV4.5F A OR
SV4.5FB Flashing
AND SV4.5SC
STORM COLLAR
SV4.5VF
Firestop/Spacer
SV4.5L6/12/24/36/48
V ent Sections
40' Ma x
(12.2 M)
1" (25.4 mm)
Minimum
Clearance to
Combustibles
When using Secure Flex
use Firestop/Spacer
SF4.5VF
VERTICAL TERMINATION SYSTEMS (ROOF)
See Figure 19 and Figures 29-33 on Pages 17 and
18 and their associated Vertical Vent Tables which
illustrate the various vertical venting configurations
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 specified in ANSI Z223.1-
(latest edition) (In Canada, the current CAN-1 B149
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 may need to be installed when
vertical termination is used. See Installation of
Vent Restrictor on Page 12 for guidelines.
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 7 and Page 33 - Item
3). It is recommended that you 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.
* 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