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Figure 3.7 (below) shows an installation in which there is a vertical rise V
o
90
elbow, a horizontal run H
example the equivalent length of the first 90
have an equivalent horizontal length of
vertical run V
and the horizontal run H
1
horizontal run H1 allowable in order for the appliance to properly function.
In this example if V
were to be 3 ½ feet, then by again referring to Figure 3.5 it can be determined that for a
1
vertical rise of 3 ½ feet the maximum horizontal run must be 10 feet.
Therefore H
Therefore in order for this system to be viable the total horizontal length H
Figure 3.6 – Example 1
Determining Allowable Vent Configurations
o
, another 90
elbow, and a horizontal run H
1
o
elbow would be 2 horizontal feet; the second 90
feet. If in this example the design of the system is constrained by the
4
, then the Figure 3.5 would be used to determine the maximum
2
H
= H
+ H
T
1
= 10 feet
Where H
= 2 + H
Equivalent
+ H
= 10 – 6
1
2
= 4 feet.
+ H
Equivalent
2
+ 4 + H
1
2
Determining Allowable Vent Configurations
off the back of unit, followed by a
1
to the vent termination. In this
2
+ H
must not exceed 4 feet.
1
2
Figure 3.7 – Example 2
o
elbow would
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