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

ELBOW VENT LENGTH VALUES

 

feet

inches

0.03

0.5

15°

0.45

6.0

30°

0.9

.0

45°

.35

6.0

90°*

.7

32.0

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

TOP EXIT / horizontal termination

figure 4

when (Ht) < (Vt)

Simple venting configuration (only one 90° elbow)

vertical rise in

feet

VT

horizontal vent run PLUS OFFSET in feet HT

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

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

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

Formula 1: HT < VT

 

 

Formula 2: HT

+ VT < 40 feet

 

 

 

90°

H2

figure 5

 

V2

 

 

 

 

 

 

 

 

90°

 

 

 

9

H1

 

 

 

 

 

 

 

V1

 

 

Example 1:

 

 

 

V1

= 3 ft

 

 

 

V2

= 8 ft

 

 

 

VT

= V1 + V2 = 3 + 8 = 11 ft

 

 

H1

= 2.5 ft

 

 

 

H2

= 2 ft

 

 

 

HR

= H1 + H2 = 2.5 + 2 = 4.5 ft

 

 

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 0.9 < 40

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

W415-0536 / C / 09.06.06

Page 7
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Napoleon Fireplaces GD82NT, GD82PT manual TOP Exit / horizontal termination, Definitions, Elbow Vent Length Values

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