Figure 19, Vertical termination systems (roof), Table 7 – Superior SDV35 User Manual

Page 13: Effective vent length

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13

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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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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8

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0

1

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1

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1

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2

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1

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2

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1

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5

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

T

O

T

A

L

Q

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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

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