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Simple venting configuration (only one
45° and 90° elbow)
For vent configurations requiring more than two 90° elbows, the following formulas apply:
Formula 1: H
< 4.2V
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)
R
1
2
3
4
= 5.5 FT(1.7m)
H
= .03 (one 45° elbow + four 90° elbows - 135°)
O
= .03 (405 - 135°) = 8.1 FT (2.5m)
H
= H
+ H
= 5.5 FT (1.7m) + 8.1 FT (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
< 4.2FT (1.3m) VT
T
4.2FT (1.3m) VT = 4.2 FT (1.3m) x 5.5 FT (1.7m)
13.6 FT (4.2m) < 23.1 FT (7M)
Formula 2:
H
+ V
< 24.75 FT (7.5m)
T
T
19.1 FT (5.8m) < 24.75 FT (7.5m)
Since both formulas are met, this vent configuration is acceptable.
(H
) > (V
T
= 23.1 FT (7m)
)
T
See graph to determine the required vertical rise V
required horizontal run H
12.3 (3.8)
REQUIRED
8.3 (2.5)
VERTICAL RISE IN
FEET (METERS)V
T
4.8 (1.5)
4.2 (1.3)
0
HORIZONTAL VENT RUN PLUS OFFSET IN FEET (METERS) H
The shaded area within the lines represents acceptable
values for H
90°
H
1
V
1
45°
venting
for the
T
.
T
5
15
10
20
(1.5)
(4.6)
(3.1)
(6.1)
12.5
(3.8)
T
and H
T
T
90°
90°
H
H
4
3
V
2
H
2
90°
W415-2884 / A / 09.21.20
EN
15
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