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14
3.7
ELBOW VENT LENGTH VALUES
FEET
EN
1°
0.03
15°
0.45
30°
0.9
45°
1.35
90°*
2.7
* The fi rst 90° offset has a zero value and is shown in the formula as - 90°
3.8
TOP EXIT HORIZONTAL TERMINATION
Simple venting configuration (only one 90° elbow)
For vent configurations requiring more than one 90° elbow, the following formulas apply:
Formula 1: H
Formula 2: H
Example:
V
= 3 FT (0.9m)
1
V
= 8 FT (2.4m)
2
V
= V
+ V
= 3 FT (0.9m) + 8 FT (2.4m) = 11 FT (3.4m)
T
1
2
H
= 2.5 FT (0.8m)
1
H
= 2 FT (0.6m)
2
H
= H
+ H
= 2.5 FT (0.8m) + 2 FT (0.6m) = 4.5 FT (1.4m)
R
1
2
H
= .03 (three 90° elbows - 90°) = .03 (270° - 90°) = 5.4 FT (1.7m)
O
H
= H
+ H
T
R
O
H
+ V
= 9.9 FT (3m) + 11 FT (3.4m) = 20.9 FT (6.4m)
T
T
Formula 1:
Formula 2:
Since both formulas are met, this vent configuration is acceptable.
W415-1351 / 08.29.14
INCHES
MILLIMETERS
0.5
12.7
6.0
152.4
11.0
279.4
16.0
406.4
32.0
812.8
< V
T
T
+ V
< 35 feet (10.7m)
T
T
= 4.5 FT (1.4m) + 5.4 FT (1.7m) = 9.9 FT (3m)
H
< V
T
T
9.9 FT (3m) < 11 FT (3.4m)
H
+ V
< 35 FT (10.7m)
T
T
20.9 FT (6.4m) < 35 FT (10.7m)
(H
) < (V
)
T
T
See graph to determine the required vertical rise V
40 (12.2)
35 (10.7)
30 (9.1)
REQUIRED
VERTICAL
20 (6.1)
RISE IN FEET
(METERS) V
T
10 (3.1)
0
2.5
(0.8)
HORIZONTAL VENT RUN PLUS OFFSET IN FEET
The shaded area within the lines represents acceptable
15.1A
required horizontal run H
.
T
5
7.5
10
12.5
15
(1.5)
(2.3)
(3.1)
(3.8)
(4.6)
(METERS)H
T
values for H
and V
T
T
90°
V
2
90°
H
90°
1
V
1
16.6B
for the
T
17.5
20
(5.3)
(6.1)
H
2
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