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EN
W415-2757 / D / 11.05.20
21
venting requirements
(H
T
) < (V
T
)
Simple venting configurations.
See graph to determine the required vertical rise V
T
for the
required horizontal run H
T
.
For vent configurations requiring one or more 90° elbows the following formulas apply:
Formula 1: H
T
< V
T
Formula 2: H
T
+ V
T
< 40 feet (12.2m)
Example:
V
1
= 5 ft (1.5m)
V
2
= 6 ft (1.8m)
V
3
= 10 ft (3.1m)
V
T
= V
1
+ V
2
+ V
3
= 5 ft (1.5m) + 6 ft (1.8m) + 10 ft (3.1m) = 21 ft (6.4m)
H
1
= 8 ft (2.4m)
H
2
= 2.5 ft (0.8m)
H
R
= H
1
+ H
2
= 8 ft (2.4m) + 2.5 ft (0.8m) = 10.5 ft (3.2m)
H
O
= .03 (four 90° elbows - 90°)
= .03 (360° - 90°) = 8.1 ft (2.5m)
H
T
= H
R
+ H
O
= 10.5 ft (3.2m) + 8.1 ft (2.5m) = 18.6 ft (5.7m)
H
T
+ V
T
= 18.6 ft (5.7m) + 21 ft (6.4m) = 39.6 ft (12.1m)
Formula 1: H
T
< V
T
18.6 ft (5.7m) < 21 ft (6.4m)
Formula 2: H
T
+ V
T
< 40 ft (12.19m)
39.6 ft (12.1m) < 40 ft (12.2m)
Since both formulas are met, this vent configuration is acceptable.
90°
V
1
V
2
H
1
H
2
The shaded area within the lines represents acceptable
values for H
T
and V
T
90°
90°
90°
0
5
(1.5)
10
(3.1)
15
(4.6)
20
(6.1)
40 (12.2)
10 (3.1)
20 (6.1)
30 (9.1)
3 (0.9)
V
3
Required vertical
rise in feet
(meters) V
T
Horizontal vent run plus offset in feet (meters) H
T
3.7 vertical termination
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