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when (H
) > (V
)
T
T
Simple venting configuration (only one 45º and 90° elbow)
See graph to determine the re-
quired vertical rise V
for the re-
T
quired horizontal run H
.
T
REQUIRED
VERTICAL
RISE IN
INCHES (V
)
T
HORIZONTAL VENT RUN PLUS OFFSETS IN FEET (HT)
The shaded area within the lines represents acceptable
values for H
and V
.
T
T
For vent configurations requiring more than one 45º and
90° elbow the following formulas apply:
Formula 1: H
< 4.2 V
T
T
Formula 2: H
+ V
< 24.75 feet
T
T
HORIZONTAL TERMINATION
FIGURE 7
Example 2:
FIGURE 8
45°
H
1
90°
V
1
V
= 4 ft
1
V
= 1.5 ft
2
V
= V
+ V
= 4 ft + 1.5 ft = 5.5 ft
T
1
2
H
= 2 ft
1
H
= 1 ft
2
H
= 1 ft
3
H
= 1.5 ft
4
H
= H
+ H
+ H
R
1
2
3
H
= .03(one 45º elbow + three 90º elbow -135º)
O
=.03(315-135)=5.4ft
H
= H
+ H
= 5.5 +5.4 = 10.9 ft
T
R
O
H
+ V
= 10.9 + 5.5 = 16.4 ft
T
T
Formula 1: H
< 4.2 V
T
4.2 V
10.9 < 23.1
Formula 2: H
+ V
< 24.75 feet
T
T
16.4 < 24.75
Since both formulas are met, this vent configuration is ac-
ceptable.
90°
90°
H
V
3
2
H
2
+ H
= 2 + 1 + 1 + 1. 5 = 5.5 ft
4
T
= 4.2 x 5.5 = 23.1 ft
T
W415-0484 / A / 07.23.06
11
H
4
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