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W415-0299 / J / 04.14.08
See graph to determine the required
vertical rise V
T
for the required hori-
zontal run H
T
.
For vent confi gurations requiring more than one 45º and 90°
elbow the following formulas apply:
Formula 1: H
T
< 4.2 V
T
Formula 2: H
T
+ V
T
< 24.75 feet
FIGURE 7
REQUIRED
VERTICAL
RISE IN
INCHES (V
T
)
HORIZONTAL VENT RUN PLUS OFFSETS IN FEET (HT)
When (H
T
) > (V
T
)
Simple venting confi guration (only one 45º and 90° elbow)
Example 2:
V
1
= 4 ft
V
T
= V
1
= 4 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(one 45º elbow + three 90º elbows -
135º)
=.03(315-135)=5.4ft
H
T
= H
R
+ H
O
= 5.5 +5.4 = 10.9 ft
H
T
+ V
T
= 10.9 + 4 = 14.9 ft
Formula 1: H
T
< 4.2 V
T
4.2 V
T
= 4.2 x 4 = 16.8 ft
10.9 < 16.8
Formula 2: H
T
+ V
T
< 24.75 feet
14.9 < 24.75
Since both formulas are met, this vent confi guration is
acceptable.
H
4
V
1
90°
H
3
H
1
90°
H
2
90°
FIGURE 8
45°
The shaded area within the lines represents acceptable
values for H
T
and V
T
.
HORIZONTAL TERMINATION