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16
3.9
REAR EXIT HORIZONTAL TERMINATION
EN
Simple venting configuration
(only two 90° elbows)
For vent configurations requiring more than two 90° elbows, the following formulas apply:
Formula 1: H
T
Formula 2: H
T
Example:
V
= 9 FT (2.7m)
1
V
= 6 FT (1.8m)
2
V
= V
+ V
= 9FT (2.7m) + 6FT (1.8m) = 15FT (4.6m)
T
1
2
H
= 3 FT (0.9m)
1
H
= 2 FT (0.6m)
2
H
= 1.5 FT (0.5m)
3
H
= H
+ H
+ H
R
1
2
H
= .03 (four 90° elbows - 90°) = .03 (360° - 90°) = 8.1 FT (2.5m)
O
H
= H
+ H
= 6.5FT (2m) + 8.1FT (2.5m) = 14.6FT (4.5m)
T
R
O
H
+ V
= 14.6FT (4.5m) + 15FT (4.6m) = 29.6 FT (9m)
T
T
Formula 1:
Formula 2:
Since both formulas are met, this vent configuration is acceptable.
W415-1333 / 06.25.14
< V
T
+ V
< 40 feet (12.2m)
T
= 3FT (0.9m) + 2FT (0.6m) + 1.5FT (0.5m) = 6.5FT (2m)
3
H
< V
T
T
14.6 FT (4.5m) < 15 FT (4.6m)
H
+ V
< 40 FT (12.2m)
T
T
29.6 FT (9m) < 40 FT (12.2m)
(H
) < (V
)
T
T
See graph to determine the required vertical rise V
horizontal run H
40 (12.2)
38.3 (11.7)
30 (9.1)
REQUIRED
VERTICAL
RISE IN
20 (6.1)
FEET
(METERS) V
T
10 (3.1)
1.6 (0.5)
2.5
0
(0.8)
1.6
(0.5)
HORIZONTAL VENT RUN PLUS OFFSET IN FEET (METERS) H
The shaded area within the lines represents acceptable values for H
for the required
T
.
T
5
7.5
10
12.5
15
(1.5)
(2.3)
(3.1)
(3.8)
(4.6)
and H
T
90°
H
3
V
2
90°
H
2
90°
V
1
H
1
90°
16.3A
17.5
20
(5.3)
(6.1)
T
T
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