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3.8
HORIZONTAL TERMINATION
Simple venting configuration
(only two 90° elbows)
For vent configurations requiring more than two 90° elbows, the following formulas apply:
Formula 1: H
< V
T
Formula 2: H
+ V
T
Example:
V
= 9 FT
1
V
= 6 FT
2
V
= V
+ V
= 9 + 6 = 15 FT
T
1
2
H
= 3 FT
1
H
= 2 FT
2
H
= 1.5 FT
3
H
= H
+ H
+ H
= 3 + 2 + 1.5 = 6.5 FT
R
1
2
3
H
= .03 (four 90° elbows - 90°) = .03 (360° - 90°) = 8.1 FT
O
H
= H
+ H
= 6.5 + 8.1 = 14.6 FT
T
R
O
H
+ V
= 14.6 + 15 = 29.6 FT
T
T
Formula 1:
H
14.6 < 15
Formula 2:
H
29.6 < 40
Since both formulas are met, this vent configuration is acceptable.
T
< 40 feet
T
< V
T
T
+ V
< 40 FT
T
T
(H
) < (V
)
T
T
See graph to determine the required vertical rise V
horizontal run H
40
38.3
30
REQUIRED
VERTICAL
20
RISE IN
FEET V
T
10
1.6
0
2.5
1.6
HORIZONTAL VENT RUN PLUS OFFSET IN FEET H
The shaded area within the lines represents acceptable values for H
for the required
T
.
T
5
7.5
10
12.5
15
and H
T
90°
H
3
V
2
90°
H
2
90°
V
1
H
1
90°
16.3
W415-0662 / D / 08.10.12
15
17.5
20
T
T
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