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Simple venting configurations.
For vent configurations requiring more than two 90° elbows the following formulas apply:
Formula 1: H
< 3V
T
T
Formula 2: H
+ V
< 40 feet (12.2m)
T
T
Example:
V
= 2 ft (0.6m)
1
V
= 1 ft (0.3m)
2
V
= 1.5 ft (0.5m)
3
V
= V
+V
+V
= 2 ft (0.6m) + 1 ft (0.3m) + 1.5 ft (0.5m) = 4.5 ft (1.4m)
T
1
2
3
H
= 6 ft (1.8m)
1
H
= 2 ft (0.6m)
2
H
= H
+ H
= 6 ft (1.8m) + 2 ft (0.6m) = 8 ft (2.4m)
R
1
2
H
= .03 (four 90° elbows - 90°)
O
= .03 (360° - 90°) = 8.1 ft (2.5m)
H
= H
+ H
= 8 ft (2.4m) + 8.1 ft (2.5m) = 16.1 ft (4.9m)
T
R
O
H
+ V
= 16.1ft (4.9m) + 4.5 ft (1.4m) = 20.6 ft (6.3m)
T
T
Formula 1:
H
< 3V
T
T
3V
= 3 ft (0.9m) x 4.5 ft (1.4m) = 13.5 ft (4.1m)
T
16.1 ft (4.9m) > 13.5 ft (4.1m)
Since this formula is not met, this vent configuration is unacceptable.
Formula 2:
H
+ V
< 40 ft (12.2m)
T
T
20.6 ft (6.3m) < 40 ft (12.2m)
Since only formula 2 is met, this vent configuration is unacceptable and a new appliance location or vent configuration will
need to be established to satisfy both formulas.
(H
) > (V
)
T
T
See graph to determine the required vertical rise V
20 (6.1)
19 (5.8)
Required vertical
rise in feet
10 (3.1)
(meters) V
T
3 (0.9)
0
Horizontal vent run plus offset in feet (meters) H
The shaded area within the lines represents acceptable
venting requirements
required horizontal run H
5
10 (3.1)
15
20
(1.5)
(4.6)
(6.1)
values for H
and V
T
T
90°
90°
H
V
V
1
2
1
EN
for the
T
.
T
25
30
(7.6)
(9.1)
T
V
3
H
2
90°
90°
23
W415-3036 / 05.07.21
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