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18
3.10 TOP OR REAR EXIT VERTICAL TERMINATION
EN
Simple venting configurations.
For vent configurations requiring one or more 90° elbows (top exit) or one 90° elbow (rear exit),
the following formulas apply:
Formula 1: H
Formula 2: H
Example:
V
= 3 FT (0.9m)
1
V
= 6 FT (1.8m)
2
V
= 8 FT (2.4m)
3
V
= V
+ V
+ V
T
1
2
H
= 2 FT (0.6m)
1
H
= 2.5 FT (0.8m)
2
H
= H
+ H
R
1
2
H
= .03 (four 90° elbows - 90°)
O
= .03 (360° - 90°) = 8.1 FT (2.5m)
H
= H
+ H
T
R
O
H
+ V
= 12.6FT (3.8m) + 17FT (5.2m) = 29.6FT (9m)
T
T
Formula 1:
Formula 2:
Since both formulas are met, this vent configuration is acceptable.
W415-1351 / 08.29.14
< V
T
T
+ V
< 35 feet (10.7m)
T
T
= 3FT (0.9m) + 6FT (1.8m) + 8FT (2.4m) = 17FT (5.2m)
3
= 2FT (0.6m) + 2.5FT (0.8m) = 4.5FT (1.4m)
= 4.5FT (1.4m) + 8.1FT (2.5m) = 12.6FT (3.8m)
H
< 3.5 V
T
T
12.6FT (3.8m) < 17FT (5.2m)
H
+ V
< 35 FT (10.7m)
T
T
29.6FT (9m) < 35FT (10.7m)
(H
) < (V
)
T
T
See graph to determine the required vertical rise V
40 (12.2)
35 (10.7)
30 (9.1)
REQUIRED
VERTICAL RISE
IN FEET
20 (6.1)
(METERS) V
17.5 (5.3)
T
10 (3.1)
3 (0.9)
0
HORIZONTAL VENT RUN PLUS OFFSET IN FEET (METERS) H
The shaded area within the lines represents acceptable
required horizontal run H
.
T
5
10
15
(1.5)
(3.1)
(4.6)
values for H
and H
T
T
90°
90°
H
2
V
H
2
1
V
1
90°
18.4A
for the
T
20 (6.1)
17.5
(5.3)
T
V
3
90°
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