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3.7
ELBOW VENT LENGTH VALUES
FEET
INCHES
1°
0.03
0.5
15°
0.45
6.0
30°
0.9
11.0
45°
1.35
16.0
90°*
2.7
32.0
* 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 confi guration (only one 90° elbow)
For vent confi gurations requiring more than one 90° elbow, the following formulas apply:
Formula 1: H
< V
T
T
Formula 2: H
+ V
T
T
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
= 4.5 FT (1.4m) + 5.4 FT (1.6m) = 9.9 FT (3m)
T
R
O
H
+ V
= 9.9 FT (3m) + 11 FT (3.4m) = 20.9 FT (6.4m)
T
T
Formula 1:
H
T
9.9 FT (3m) < 11 FT (3.4m)
Formula 2:
H
T
20.9 FT (6.4m) < 40 FT (12.2m)
Since both formulas are met, this vent confi guration is acceptable.
MILLIMETERS
12.7
152.4
279.4
406.4
812.8
REQUIRED
REQUIRED
VERTICAL
VERTICAL
RISE IN FEET
RISE IN FEET
(METERS)V
(METERS)V
REQUIRED
VERTICAL
RISE IN FEET
(METERS)V
< 40 feet (12.2m)
< V
T
+ V
< 40 FT (12.2m)
T
(H
) < (V
)
T
T
See graph to determine the required vertical
rise V
for the required horizontal run H
T
40 (12.2)
40 (12.2)
39 (11.9)
39 (11.9)
30 (9.1)
30 (9.1)
20 (6.1)
20 (6.1)
40 (12.2)
T
39 (11.9)
T
10 (3.1)
10 (3.1)
30 (9.1)
0
2.5
5
0
2.5
5
7.5
(0.8)
(1.5)
20 (6.1)
(0.8)
(1.5)
(2.3)
HORIZONTAL VENT RUN PLUS OFFSET IN
HORIZONTAL VENT RUN PLUS OFFSET IN
T
FEET (METERS) H
FEET (METERS) H
10 (3.1)
The shaded area within the lines represents
acceptable values for H
0
2.5
5
7.5
(0.8)
(1.5)
(2.3)
HORIZONTAL VENT RUN PLUS OFFSET IN
FEET (METERS) H
15.1A
7.5
10
12.5
15
17.5
10
12.5
15
17.5
(2.3)
(3.1)
(3.8)
(4.6)
(5.3)
(3.1)
(3.8)
(4.6)
(5.3)
T
T
and V
10
12.5
15
17.5
20
T
T
(3.1)
(3.8)
(4.6)
(5.3)
(6.1)
90°
90°
H
T
V
V
2
2
90°
H
2
90°
90°
V
H
90°
H
2
1
90°
1
V
V
1
90°
1
H
90°
1
V
1
16.1B
W415-2183 / B / 02.10.17
15
EN
.
T
20
20
(6.1)
(6.1)
H
2
2
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