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W415-0536 / C / 09.06.06
H
2
H
1
v
1
90°
See graph to determine the required verti-
cal rise V
T
for the required horizontal run
H
T
.
v
1
= v
T
= 6 ft
H
1
= 3 ft
H
2
= 5 ft
H
R
= H
1
+ H
2
= 3 + 5 = 8 ft
H
O
= .03(two 90° elbows - 90°) = .03(180° - 90°) = 2.7 ft
H
T
= H
R
+ H
O
= 8 + 2.7 = 10.7 ft
H
T
+ v
T
=
10.7 + 6 =16.7
Formula 1: H
T
< 4.2 v
T
4.2 v
T
= 4.2 x 6 = 25.2 ft
10.7 < 25.2
Formula 2: H
T
+ v
T
< 24.75 feet
16.7 < 24.75
-
ceptable.
following formulas apply:
Formula 1: H
T
< 4.2 v
T
Formula 2: H
T
+
T
< 24.75 feet
Example 2:
Example 3:
v
1
= 4 ft
v
2
= 1.5 ft
v
T
= v
1
+ v
2
= 4 + 1.5 = 5.5 ft
H
1
= 2 ft
H
2
= 1 ft
H
3
= 1 ft
H
4
= 1.5 ft
H
R
= H
1
+ H
2
+ H
3
+ H
4
= 2 + 1 + 1 + 1. 5 = 5.5 ft
H
O
= .03(four 90° elbows - 90°) = .03(360° - 90°) = 8.1 ft
H
T
= H
R
+ H
O
= 5.5 + 8.1 = 13.6 ft
H
T
+ v
T
= 13.6 + 5.5 = 19.1 ft
Formula 1: H
T
< 4.2 v
T
4.2 v
T
= 4.2 x 5.5 = 23.1 ft
13.6 < 23.1
Formula 2: H
T
+ v
T
< 24.75 feet
19.1 < 24.75
acceptable.
FIGURE 6
FIGURE 7
required
vertical
rise in
inches
v
T
horizontal vent run Plus offset in feet H
T
FIGURE 8
H
2
H
4
v
2
90°
H
3
H
1
v
1
90°
The shaded area within the lines represents acceptable
values for H
T
and V
T
.
when (H
T
) > (v
T
)
TOP EXIT / HORIzONTAL TERMINATION