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venting requirements
EN
3.7
vertical termination
Simple venting configurations.
For vent configurations requiring one or more 90° elbows the following formulas apply:
Formula 1: H
< V
T
T
Formula 2: H
+ V
< 40 feet (12.2m)
T
T
Example:
V
= 5 ft (1.5m)
1
V
= 6 ft (1.8m)
2
V
= 10 ft (3.1m)
3
V
= V
+ V
+ V
= 5 ft (1.5m) + 6 ft (1.8m) + 10 ft (3.1m) = 21 ft (6.4m)
T
1
2
3
H
= 8 ft (2.4m)
1
H
= 2.5 ft (0.8m)
2
H
= H
+ H
= 8 ft (2.4m) + 2.5 ft (0.8m) = 10.5 ft (3.2m)
R
1
2
H
= .03 (four 90° elbows - 90°)
O
= .03 (360° - 90°) = 8.1 ft (2.5m)
H
= H
+ H
= 10.5 ft (3.2m) + 8.1 ft (2.5m) = 18.6 ft (5.7m)
T
R
O
H
+ V
= 18.6 ft (5.7m) + 21 ft (6.4m) = 39.6 ft (12.1m)
T
T
Formula 1:
H
T
18.6 ft (5.7m) < 21 ft (6.4m)
Formula 2:
H
T
39.6 ft (12.1m) < 40 ft (12.2m)
Since both formulas are met, this vent configuration is acceptable.
22
W415-3036 / 05.07.21
Required vertical
rise in feet
(meters) V
< V
T
+ V
< 40 ft (12.19m)
T
(H
) < (V
)
T
T
See graph to determine the required vertical rise V
required horizontal run H
40 (12.2)
30 (9.1)
20 (6.1)
T
10 (3.1)
3 (0.9)
0
Horizontal vent run plus offset in feet (meters) H
The shaded area within the lines represents acceptable
values for H
90°
V
1
T
.
T
5
10
15
20
(1.5)
(3.1)
(4.6)
(6.1)
and V
T
T
90°
H
2
V
2
H
1
90°
for the
T
V
3
90°
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