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EN
W415-2367 / B / 12.09.20
19
venting requirements
Simple venting configuration
(only two 90° elbows)
See graph to determine the required vertical rise V
T
for the
required horizontal run H
T
.
REQUIRED
VERTICAL RISE IN
INCHES
(MILLIMETERS)V
T
HORIZONTAL VENT RUN PLUS OFFSET IN FEET (METERS) H
T
The shaded area within the lines represents acceptable
values for H
T
and H
T
90°
V
1
V
2
H
1
H
2
90°
90°
90°
H
3
(H
T
) > (V
T
)
50 (1270)
100 (2540)
150(3810)
0
2.5
(0.8)
5
(1.5)
7.5
(2.3)
10
(3.1)
12.5
(3.8)
15
(4.6)
17.5
(5.3)
20
(6.1)
147 (3733.8
12
(304.8)
66
(1676.4)
1
(0.3)
3.5
(1.1)
19.25
(5.9)
16.3_2B
For vent configurations requiring more than two 90° elbows, the following formulas apply:
Formula 1: H
T
< 3.5V
T
Formula 2: H
T
+ V
T
< 24.75 feet (7.5m)
Example:
V
1
= 4 FT (1.2m)
V
2
= 1.5 FT (0.5m)
V
T
= V
1
+ V
2
= 4FT (1.2m) + 1.5FT (0.5m) = 5.5 FT (1.7m)
H
1
= 2 FT (0.6m)
H
2
= 1 FT (0.3m)
H
3
= 1 FT (0.3m)
H
4
= 1.5 FT (0.5m)
H
R
= H
1
+ H
2
+H
3
+H
4
= 2FT(0.6m) + 1FT(0.3m) + 1FT(0.3m) + 1.5FT(0.5m) = 5.5 FT(1.7m)
H
O
= .03 (four 90° elbows + one 45° elbow - 90°)
= .03 (90 + 90 + 90 + 90 + 45 - 90) = 9.45 FT (2.9m)
H
T
= H
R
+ H
O
= 5.5FT (1.7m) + 9.45FT (2.9m) = 14.95FT (4.6m)
H
T
+ V
T
= 14.95FT (4.6m) + 5.5FT (1.7m) = 20.45FT (6.2m)
Formula 1: H
T
< 3.5V
T
3.5V
T
= 3.5FT (1.1m) x 5.5FT (1.7m) = 19.25FT (5.9m)
14.95 FT (4.6m) < 19.25 FT (5.9m)
Formula 2: H
T
+ V
T
< 24.75 FT (7.5m)
20.45 FT (6.2m) < 24.75 FT (7.5m)
Since both formulas are met, this vent configuration is acceptable.
50 (1270)
100 (2540)
150(3810)
(H
T
) < (V
T
)
Simple venting configuration
(only one 90° elbow)
See graph to determine the required vertical rise V
T
for the required horizontal run H
T
.
0
2.5
(0.8)
5
(1.5)
7.5
(2.3)
10
(3.1)
12.5
(3.8)
15
(4.6)
40 (12.2)
10 (3.1)
20 (6.1)
30 (9.1)
17.5
(5.3)
20
(6.1)
39 (11.9)
HORIZONTAL VENT RUN PLUS OFFSET IN
FEET (METERS) H
T
For vent configurations requiring more than one 90° elbow, the following formulas apply:
Formula 1: H
T
< V
T
Formula 2: H
T
+ V
T
< 40 feet (12.2m)
Example 1:
V
1
= 3 FT (0.9m)
V
2
= 8 FT (2.4m)
V
T
= V
1
+ V
2
= 3FT (0.9m) + 8FT (2.4m) = 11FT (3.4m)
H
1
= 2.5 FT (0.8m)
H
2
= 2 FT (0.6m)
H
R
= H
1
+ H
2
= 2.5FT (0.8m) + 2FT (0.6m) = 4.5 FT (1.4m)
H
O
= .03 (three 90° elbows - 90°) = .03 (270° - 90°) = 5.4 FT (1.6m)
H
T
= H
R
+ H
O
= 4.5FT (1.4m) + 5.4FT (1.6m) = 9.9 FT (3m)
H
T
+ V
T
= 9.9FT (3m) + 11FT (3.4m) = 20.9FT (6.4m)
Formula 1: H
T
< V
T
9.9FT (3m) < 11FT (3.4m)
Formula 2: H
T
+ V
T
< 40 FT (12.2m)
20.9FT (6.4m) < 40 FT (12.2m)
Since both formulas are met, this vent configuration is acceptable.
90°
90°
90°
V
1
V
2
H
1
H
2
The shaded area within the lines represents
acceptable values for H
T
and V
T
0
2.5
(0.8)
5
(1.5)
7.5
(2.3)
10
(3.1)
12.5
(3.8)
15
(4.6)
40 (12.2)
10 (3.1)
20 (6.1)
30 (9.1)
17.5
(5.3)
20
(6.1)
39 (11.9)
GD36
BGD36
REQUIRED
VERTICAL
RISE IN FEET
(METERS)V
T
HORIZONTAL VENT RUN PLUS OFFSET IN
FEET (METERS) H
T
16.2B
REQUIRED
VERTICAL
RISE IN FEET
(METERS)V
T
0
2.5
(0.8)
5
(1.5)
7.5
(2.3)
10
(3.1)
12.5
(3.8
(H
T
) < (V
T
)
Simple venting configuration
(only one 90° elbow)
See graph to determine the required vertical rise V
T
for the required horizontal run H
T
.
0
2.5
(0.8)
5
(1.5)
7.5
(2.3)
10
(3.1)
12.5
(3.8)
15
(4.6)
40 (12.2)
10 (3.1)
20 (6.1)
30 (9.1)
17.5
(5.3)
20
(6.1)
39 (11.9)
HORIZONTAL VENT RUN PLUS OFFSET IN
FEET (METERS) H
T
For vent configurations requiring more than one 90° elbow, the following formulas apply:
Formula 1: H
T
< V
T
Formula 2: H
T
+ V
T
< 40 feet (12.2m)
Example 1:
V
1
= 3 FT (0.9m)
V
2
= 8 FT (2.4m)
V
T
= V
1
+ V
2
= 3FT (0.9m) + 8FT (2.4m) = 11FT (3.4m)
H
1
= 2.5 FT (0.8m)
H
2
= 2 FT (0.6m)
H
R
= H
1
+ H
2
= 2.5FT (0.8m) + 2FT (0.6m) = 4.5 FT (1.4m)
H
O
= .03 (three 90° elbows - 90°) = .03 (270° - 90°) = 5.4 FT (1.6m)
H
T
= H
R
+ H
O
= 4.5FT (1.4m) + 5.4FT (1.6m) = 9.9 FT (3m)
H
T
+ V
T
= 9.9FT (3m) + 11FT (3.4m) = 20.9FT (6.4m)
Formula 1: H
T
< V
T
9.9FT (3m) < 11FT (3.4m)
Formula 2: H
T
+ V
T
< 40 FT (12.2m)
20.9FT (6.4m) < 40 FT (12.2m)
Since both formulas are met, this vent configuration is acceptable.
90°
90°
90°
V
1
V
2
H
1
H
2
The shaded area within the lines represents
acceptable values for H
T
and V
T
0
2.5
(0.8)
5
(1.5)
7.5
(2.3)
10
(3.1)
12.5
(3.8)
15
(4.6)
40 (12.2)
10 (3.1)
20 (6.1)
30 (9.1)
17.5
(5.3)
20
(6.1)
39 (11.9)
GD36
BGD36
REQUIRED
VERTICAL
RISE IN FEET
(METERS)V
T
HORIZONTAL VENT RUN PLUS OFFSET IN
FEET (METERS) H
T
16.2B
REQUIRED
VERTICAL
RISE IN FEET
(METERS)V
T
15
(4.6)
17.5
(5.3)
20
(6.1)
147 (3733.8
8 (203)
66
(1676.4)
1
(0.3)
3.5
(1.1)
19.25
(5.9)
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