9

 

VERTICAL TERMINATION

 

when (HT) > (VT)

For vent configurations requiring more than two 90°

Simple venting configurations

elbow the following formulas apply:

 

 

 

FIGURE 10

Formula 1: HT < 3VT

 

 

Formula 2: HT + VT < 40 feet

 

Example 7:

 

 

90°

90°

 

 

 

 

V3

 

V

H2

 

1

V2

 

H1

90°

 

 

 

 

90°

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

 

19

20

 

 

 

 

 

 

 

 

 

 

 

 

 

FIGURE 11

MAXIMUM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VERTICAL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RISE

IN

10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FEET

3

 

 

 

 

 

 

 

 

 

 

V1

= 2 ft

 

 

 

VT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

5

 

10

15

2

0

25

30

V2

= 1 ft

 

 

 

 

 

 

 

V3

= 1.5 ft

 

 

HORIZONTAL VENT RUN PLUS OFFSET IN FEET

 

 

 

T

V

= V + V + V = 2 + 1 + 1.5 = 4.5 ft

The shaded area within the lines represents acceptable

T

 

1

2

3

 

values for H

T

and V

T

.

 

 

 

 

 

H1

= 6 ft

 

 

 

 

 

 

 

 

 

 

 

 

 

H2

= 2 ft

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HR

= H1 + H2 = 6 + 2 = 8 ft

 

 

 

 

 

 

 

 

 

 

 

 

HO

= .03(four 90° elbows - 90°)

 

 

 

 

 

 

 

 

 

 

 

 

 

= .03(90 + 90 + 90 + 90 - 90) = 8.1 ft

 

 

 

 

 

 

 

 

 

 

 

 

HT

= HR + HO= 8 + 8.1 = 16.1 ft

 

 

 

 

 

 

 

 

 

 

 

 

HT + VT = 16.1 + 4.5 = 20.6 ft

 

 

 

 

 

 

 

 

 

 

 

 

Formula 1:

HT< 3VT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3VT

= 3 x 4.5 = 13.5 ft

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

16.1 > 13.5

 

Since this formula is not met, this vent configuration is unacceptable.

Formula 2: HT+ VT < 40 feet 20.6 < 40

Since only formula 2 is met, this vent configuration is unac- ceptable and a new fireplace location or vent configuration will need to be established to satisfy both formulas.

W415-0434 / C / 03.24.05

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Image 9
Napoleon Fireplaces GD70PT-S, GD70NT-S manual Formula 1 H T 3V T Formula 2 H T + V T 40 feet Example
Page 8 Page 10

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