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2.7
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
< 40 feet (12.2m)
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
< V
T
9.9 FT (3m) < 11 FT (3.4m)
Formula 2:
H
+ V
T
20.9 FT (6.4m) < 40 FT (12.2m)
Since both formulas are met, this vent confi guration is acceptable.
(H
39 (11.9)
REQUIRED
REQUIRED
REQUIRED
VERTICAL
VERTICAL
VERTICAL
RISE IN FEET
RISE IN FEET
RISE IN FEET
(METERS)V
(METERS)V
(METERS)V
40 (12.2)
T
T
39 (11.9)
T
REQUIRED
30 (9.1)
VERTICAL
RISE IN FEET
20 (6.1)
(METERS)V
T
10 (3.1)
T
< 40 FT (12.2m)
T
venting requirements
) < (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)
40 (12.2)
39 (11.9)
30 (9.1)
30 (9.1)
30 (9.1)
20 (6.1)
20 (6.1)
20 (6.1)
10 (3.1)
10 (3.1)
10 (3.1)
0
0
2.5
2.5
5
5
7.5
7.5
0
2.5
5
7.5
(0.8)
(1.5)
(2.3)
(0.8)
(1.5)
(2.3)
HORIZONTAL VENT RUN PLUS OFFSET IN FEET
HORIZONTAL VENT RUN PLUS OFFSET IN FEET
(0.8)
(1.5)
(2.3)
HORIZONTAL VENT RUN PLUS OFFSET IN FEET
(METERS) H
(METERS) H
(METERS) H
The shaded area within the lines represents
acceptable values for H
0
2.5
5
7.5
10
(0.8)
(1.5)
(2.3)
(3.1)
HORIZONTAL VENT RUN PLUS OFFSET IN FEET
(METERS) H
T
10
10
12.5
12.5
15
15
17.5
17.5
20
20
10
12.5
15
17.5
20
(3.1)
(3.8)
(4.6)
(5.3)
(6.1)
(3.1)
(3.8)
(4.6)
(5.3)
(6.1)
(3.1)
(3.8)
(4.6)
(5.3)
(6.1)
T
T
T
and V
12.5
15
17.5
20
T
T
(3.8)
(4.6)
(5.3)
(6.1)
90°
90°
90°
H
H
H
T
V
V
V
2
2
2
90°
H
2
90°
90°
90°
V
H
H
90°
90°
H
2
1
1
90°
1
V
V
V
1
1
90°
1
H
90°
1
V
1
16.1B
W415-1847 / 08.10.18
EN
.
2
2
2
17
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