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9
W415-0536 / C / 09.06.06
required vertical
rise in feet
v
T
horizontal vent run Plus offset in
feet
H
T
when (H
T
) < (v
T
)
FIGURE 9
90° elbow (top exit) or one 90° elbow (rear exit), the
following formulas 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
.
TOP EXIT vERTICAL TERMINATION
The shaded area within the lines represents ac-
ceptable values for H
T
and V
T
.
maximum
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
.
See graph to determine the required vertical rise v
T
for the
required horizontal run H
T
.
FIGURE 11
v
3
= 1.5 ft
v
T
=
v
1
+
v
2
+
v
3
=
2 + 1 + 1.5 = 4.5 ft
H
1
= 6 ft
H
2
= 2 ft
H
R
= H
1
+ H
2
= 6 + 2 = 8 ft
H
O
= .03(four 90° elbows - 90°)
= .03(90 + 90 + 90 + 90 - 90) = 8.1 ft
H
T
= H
R
+ H
O
= 8 + 8.1 = 16.1 ft
H
T
+ v
T
= 16.1 + 4.5 = 20.6 ft
Formula 1: H
T
< 3v
T
3v
T
=
3 x
4.5 = 13.5 ft
16.1 > 13.5
acceptable.
Formula 2: H
T
+ v
T
< 40 feet
20.6 < 40
formulas.
FIGURE 10
H
1
H
2
v
3
v
1
90°
90°
90°
v
2
90°
when (H
T
) > (v
T
)
TOP vERTICAL TERMINATION
(top exit) or one 90° elbow (rear exit), the following formulas
apply:
Formula 1: H
T
< 3v
T
Formula 2: H
T
+ v
T
< 40 feet
Example 7:
v
1
= 2 ft
v
2
= 1 ft