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W415-0327 / B / 12.07.07
11
V
1
HORIZONTAL TERMINATION
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 8
REQUIRED
VERTICAL
RISE IN
INCHES (V
T
)
HORIZONTAL VENT RUN PLUS OFFSETS IN FEET
when (H
T
) > (V
T
)
Simple venting confi guration (only one 45º and 90° elbow)
Example 2:
V
1
= 4 ft
V
2
= 1.5 ft
V
T
= V
1
+
V
2
= 4 ft + 1.5 ft = 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 (one 45º elbow + four 90º elbows -135º)
=.03 (405-135)=8.1ft
H
T
= H
R
+ H
O
= 5.5 + 8.1 = 13.6ft
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
Since both formulas are met, this vent confi guration is ac-
ceptable.
H
4
90°
H
3
H
1
90°
H
2
90°
FIGURE 9
45°
The shaded area within the lines represents acceptable values
for H
T
and V
T
.
V
2
90°