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Simple venting configuration (only one 90° elbow)
For vent configurations requiring more than one 90° elbow, the following formulas apply:
Formula 1: H
< 4.2 V
T
T
Formula 2: H
+ V
< 24.75 feet (7.5m)
T
T
Example:
V
= V
= 6 FT (1.8m)
1
T
H
= 3 FT (0.9m)
1
H
= 5 FT (1.5m)
2
H
= H
+ H
= 3FT (0.9m + 5FT (1.5m) = 8FT (2.4m)
R
1
2
H
= .03 (two 90° elbows - 90°) = .03 (180° - 90°) = 2.7FT (0.8m)
O
H
= H
+ H
= 8FT (2.4m) + 2.7FT (0.8m) = 10.7FT (3.3m)
T
R
O
H
+ V
= 10.7FT (3.3m) + 6FT (1.8m) = 16.7FT (5.1m)
T
T
Formula 1:
H
< 4.2 V
T
T
4.2 V
10.7FT (3.3m) < 25.2FT (7.7m)
Formula 2:
H
+ V
< 24.75 FT (7.5m)
T
T
16.7FT (5.1m) < 24.75 FT (7.5m)
Since both formulas are met, this vent configuration is acceptable.
Example:
V
= 4 FT (1.2m)
1
V
= 1.5 FT (0.5m)
2
V
= V
+ V
= 4FT (1.2m) + 1.5FT (0.5m) = 5.5 FT (1.7m)
T
1
2
H
= 2 FT (0.6m)
1
H
= 1 FT (0.3m)
2
H
= 1 FT (0.3m)
3
H
= 1.5 FT (0.5m)
4
H
= H
+ H
+ H
+ H
= 2FT (0.6m) + 1FT (0.3m) + 1FT (0.3m) + 1.5FT (1.7m) = 5.5 FT (1.7m)
R
1
2
3
4
H
= .03 (four 90° elbows - 90°) = .03 (360° - 90°) = 8.1 FT (2.5m)
O
H
= H
+ H
= 5.5FT (1.7m) + 8.1FT (2.5m) = 13.6 FT (4.2m)
T
R
O
H
+ V
= 13.6 FT (4.2m) + 5.5 FT (1.7m) = 19.1 FT (5.8m)
T
T
Formula 1:
H
< 4.2 V
T
T
4.2 V
13.6 FT (4.2m) < 23.1 FT (7m)
Formula 2:
H
+ V
< 24.75 FT (7.5m)
T
T
19.1FT (5.8m) < 24.75 FT (7.5m)
Since both formulas are met, this vent configuration is acceptable.
(H
T
REQUIRED
VERTICAL RISE
IN INCHES
(MILLIMETERS)V
HORIZONTAL VENT RUN PLUS OFFSET IN FEET (METERS)H
= 4.2FT (1.3m) x 6FT (1.8m) = 25.2 FT (7.7m)
T
= 4.2 FT (1.3m) x 5.5 FT (1.7m) = 23.1 FT (7m)
T
) > (V
)
T
See graph to determine the required vertical rise V
required horizontal run H
150 (3810)
100 (2540)
T
50 (1270)
29 (736.6)
0
5
(1.5)
2.5
(0.8)
The shaded area within the lines represents acceptable
values for H
90°
V
1
H
90°
V
1
venting
for the
T
.
T
15
10
20
(4.6)
(3.1)
(6.1)
and V
T
T
H
1
H
2
90°
90°
90°
H
1
V
2
H
H
2
3
90°
W415-2886 / 04.14.20
EN
T
4
15
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