Napoleon Fireplaces GDS60N manual Rear Exit Horizontal Termination

19

3.10 REAR EXIT HORIZONTAL TERMINATION

(HT) < (VT)

Simple venting configuration

See graph to determine the required vertical rise VT for the required

(only two 90° elbows)

horizontal run HT.

38.3 40

REQUIRED

30

VERTICAL

20

RISE IN

FIGURE 3.10a

FEET VT

10

1.6

0

2.5

5

7.5

10

12.5

15

17.5

20

1.6

HORIZONTAL VENT RUN PLUS OFFSET IN FEET HT

The shaded area within the lines represents acceptable values for HT

and HT

90°

For vent configurations requiring more than two 90° elbows, the following formulas apply:

H3

Formula 1: H

T

< V

T

Formula 2: HT

+ VT < 40 feet

Example 4:

90°

V2

V1

= 9 FT

H2

V2

= 6 FT

= 9 + 6 = 15 FT

V

T

= V + V

2

1

H1

= 3 FT

90°

H2

= 2 FT

V1

H3

= 1.5 FT

+ H3 = 3 + 2 + 1.5 = 6.5 FT

HR

= H1

+ H2

H = .03 (four 90° elbows - 90°) = .03 (360° - 90°) = 8.1 FT

HTO

= HR

+ HO = 6.5 + 8.1 = 14.6 FT

H1

HT + VT

= 14.6 + 15 = 29.6 FT

90°

Formula 1:

HT < VT

FIGURE 3.10b

14.6 < 15

Formula 2:

HT + VT < 40 FT

29.6 < 40

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

16.3

W415-0788 / A / 09.22.09