DEFINITIONS

for the following symbols used in the venting calculations and examples are:

>- greater than

>- equal to or greater than < - less than

< - equal to or less than

HT - total of both horizontal vent lengths (HR) and offsets (HO) in feet

HR - combined horizontal vent lengths in feet

HO - offset factor: .03(total degrees of offset - 90°*) in feet

VT - combined vertical vent lengths in feet

9

ELBOW VENT LENGTH VALUES

 

feet

inches

0.03

0.5

15°

0.45

6.0

30°

0.9

11.0

45°

1.35

16.0

90°*

2.7

32.0

*the first 90° offset has a zero value and is shown in the formula as -90°

TOP EXIT / HORIZONTAL TERMINATION

(HT) < (VT)

Simple venting configuration

 

(only one 90° elbow)

FIGURE 7

 

See graph to determine the required vertical rise VT for the required horizontal run HT.

39 40

VERTICAL

RISE 30

IN FEET

VT20

10

0

2.5

5

7.5

10

12.5

15

17.5

20

HORIZONTAL VENT RUN PLUS OFFSET IN FEET HT

The shaded area within the lines represents acceptable values for HT and VT .

For vent configurations requiring more than one 90° elbow, the following formulas apply:

Formula 1: HT < VT

Formula 2: HT + VT < 40 feet

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

90°

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H

2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FIGURE 8

 

 

 

 

 

 

 

V2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

90°

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H1

90°

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

V1

 

 

 

 

 

 

Example 1:

V1

=

3 ft

 

V2

=

8 ft

+ V2 = 3 + 8 = 11 ft

VT

= V1

H1

=

2.5 ft

H2

=

2 ft

+ H2 = 2.5 + 2 = 4.5 ft

HR

= H1

HO

= .03(three 90° elbows - 90°) = .03(270° - 90°) = 5.4 ft

HT

=

HR + HO = 4.5 + 5.4 = 9.9 ft

HT + VT = 9.9 + 11 = 20.9 ft

Formula 1: HT < VT 9.9 < 11

Formula 2: HT + VT < 40 feet 20.9 < 40

Since both formulas are met, this vent configuration is acceptable.

W415-0607 / A / 01.18.08

Page 9
Image 9
Napoleon Fireplaces GDS26N, GDS26P manual TOP Exit / Horizontal Termination, Definitions, Elbow Vent Length Values

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