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Simple venting configuration
(only two 90° elbows)
For vent configurations requiring more than two 90° elbows, the following formulas apply:
Formula 1: H
< 3.5V
T
T
Formula 2: H
+ V
< 24.75 feet (7.5m)
T
T
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(0.5m) = 5.5 FT(1.7m)
R
1
2
3
4
H
= .03 (four 90° elbows + one 45° elbow - 90°)
O
= .03 (90 + 90 + 90 + 90 + 45 - 90) = 9.45 FT (2.9m)
H
= H
+ H
= 5.5FT (1.7m) + 9.45FT (2.9m) = 14.95FT (4.6m)
T
R
O
H
+ V
= 14.95FT (4.6m) + 5.5FT (1.7m) = 20.45FT (6.2m)
T
T
Formula 1:
H
< 3.5V
T
T
3.5V
T
14.95 FT (4.6m) < 19.25 FT (5.9m)
Formula 2:
H
+ V
< 24.75 FT (7.5m)
T
T
20.45 FT (6.2m) < 24.75 FT (7.5m)
Since both formulas are met, this vent configuration is acceptable.
(H
) > (V
T
REQUIRED
VERTICAL RISE IN
INCHES
(MILLIMETERS)V
HORIZONTAL VENT RUN PLUS OFFSET IN FEET (METERS) H
= 3.5FT (1.1m) x 5.5FT (1.7m) = 19.25FT (5.9m)
)
T
See graph to determine the required vertical rise V
required horizontal run H
150(3810)
147 (3733.8
100 (2540)
T
66
(1676.4)
50 (1270)
12
(304.8)
0
2.5
5
(0.8)
(1.5)
(2.3)
1
3.5
(0.3)
(1.1)
The shaded area within the lines represents acceptable
values for H
V
H
1
15
for the
T
.
T
7.5
10
12.5
15
17.5
(3.1)
(3.8)
(4.6)
(5.3)
(6.1)
19.25
(5.9)
and H
T
T
90°
H
3
V
2
90°
H
2
90°
1
90°
16.3_2B
W415-1337 / 06.23.14
EN
20
T
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