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14
3.8
horizontal termination
EN
Simple venting configuration (only one 90° elbow)
For vent configurations requiring more than one 90° elbow, the following formulas apply:
Formula 1: H
< V
T
Formula 2: H
+ V
T
Example:
V
= 3 FT (0.9m)
1
= 8 FT (2.4m)
V
2
= V
+ V
= 3 FT (0.9m ) + 8 FT (2.4m) = 11 FT (3.4m)
V
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
= 4.5 FT (1.4m) + 5.4 FT (1.6m) = 9.9 FT (3m)
H
T
R
O
+ V
= 9.9 FT (3m) + 11 FT (3.4m) = 20.9 FT (6.4m)
H
T
T
Formula 1:
H
9.9 FT (3m) < 11 FT (3.4m)
Formula 2:
H
20.9 FT (6.4m) < 40 FT (12.2m)
Since both formulas are met, this vent configuration is acceptable.
W415-2197 / A / 09.14.17
REQUIRED
REQUIRED
VERTICAL
VERTICAL
RISE IN FEET
RISE IN FEET
(METERS)V
(METERS)V
REQUIRED
VERTICAL
RISE IN FEET
(METERS)V
T
< 40 feet (12.2m)
T
< V
T
T
+ V
< 40 FT (12.2m)
T
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)
2 (0.6)
2 (0.6)
0
2.5
5
1
0
2.5
5
1
(0.8)
(1.5)
(0.3)
20 (6.1)
HORIZONTAL VENT RUN PLUS OFFSET IN FEET
(0.8)
(1.5)
(0.3)
HORIZONTAL VENT RUN PLUS OFFSET IN FEET
T
10 (3.1)
The shaded area within the lines represents ac-
2 (0.6)
ceptable values for H
0
2.5
5
7.5
1
(0.3)
(0.8)
(1.5)
(2.3)
HORIZONTAL VENT RUN PLUS OFFSET IN FEET
(METERS) H
.
T
7.5
10
12.5
15
17.5
7.5
10
12.5
15
17.5
(2.3)
(3.1)
(3.8)
(4.6)
(5.3)
(2.3)
(3.1)
(3.8)
(4.6)
(5.3)
(METERS) H
(METERS) H
T
T
and V
10
12.5
15
17.5
T
T
(3.1)
(3.8)
(4.6)
(5.3)
90°
90°
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
20
20
(6.1)
(6.1)
20
(6.1)
H
H
2
2
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