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TOP EXIT - VERTICAL TERMINATION
when (H
) < (V
)
T
T
Simple venting configurations
FIGURE 10
See graph to determine the required vertical rise V
required horizontal run H
.
T
REQUIRED
VERTICAL RISE
IN FEET
V
T
HORIZONTAL VENT RUN PLUS OFFSET IN FEET
The shaded area within the lines represents acceptable
values for H
and V
.
T
T
For vent configurations requiring elbows, the following for-
mulas apply:
Formula 1: H
< V
T
T
Formula 2: H
+ V
< 40 feet
T
T
Example 4:
FIGURE 11
for the
T
V
= 5 ft
1
V
= 10 ft
2
V
= V
+ V
T
1
H
= 1 ft
1
H
= 3 ft
2
H
= 2.5 ft
3
H
= H
+ H
R
1
H
= .03(four 90° elbows - 90°)
O
= .03(90 + 90 + 90 + 90 - 90) = 8.1 ft
H
= H
+ H
T
R
H
+ V
= 14.6 + 15 = 29.6 ft
T
T
H
Formula 1:
T
14.6 < 15
H H H H H
H
Formula 2:
T T T T T
T
29.6 < 40
Since both formulas are met, this vent configuration is ac-
ceptable.
90°
H
V
3
90°
1
H
H
2
1
90°
= 5 + 10 = 15 ft
2
+ H
= 1 + 3 + 2.5 = 6.5 ft
2
3
= 6.5 + 8.1 = 14.6 ft
O
< V
T
+ V
< 40 feet
T
W415-0221 / E / 04.09.02
11
V
2
90°
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