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Use the following steps to correctly size vent pipe diameter.
Furnace capacity?
1
Which termination?
2
Which needs most
3
elbows?
How many?
4
Desired pipe size?
5
What is the altitude?
6
Use Table 7 to find
7
max pipe length.
Figure 22.
508405-01
070, 090,
110
Standard or
Concentric?
See Table 5
Intake or
Exhaust?
1-1/2", 2",
2-1/2"
or 3"
Issue 2341
Page 17 of 53
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