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W415-0210 / E / 06.25.03
REQUIRED
VERTICAL RISE
IN FEET
V
T
HORIZONTAL VENT RUN PLUS OFFSET IN FEET
H
T
The shaded area within the lines represents acceptable
values for H
T
and V
T
.
Example 6:
V
1
=5 ft
V
2
=10 ft
V
T
=
V
1
+
V
2
=
5 + 10 = 15 ft
H
1
=3 ft
H
2
= 2.5 ft
H
R
=H
1
+ H
2
= 3 + 2.5 = 5.5 ft
H
O
=.03(three 90° elbows - 90°)
=.03(90 + 90 + 90 - 90) = 5.4 ft
H
T
=H
R
+ H
O
= 5.5 + 5.4 = 10.9 ft
H
T
+ V
T
= 10.9 + 15 = 25.9 ft
Formula 1: H
T
< V
T
10.9 < 15
Formula 2: H
T
+ V
T
< 40 feet
25.9 < 40
Since both formulas are met, this vent configuration is ac-
ceptable.
when (H
T
) < (V
T
)
Simple venting configurations
FIGURE 15
FIGURE 16
For vent configurations requiring more than zero 90° elbow
(top exit) or one 90° elbow (rear exit), the following formu-
las apply:
Formula 1: H
T
< V
T
Formula 2: H
T
+ V
T
< 40 feet
See graph to determine the required vertical rise V
T
for the
required horizontal run H
T
.
90°
90°
90°
H
1
H
2
V
1
V
2
TOP OR REAR EXIT VERTICAL TERMINATION