Lennox Allied Air A95UH1D - Page 18

507270-03Page 18 of 60 Issue 1917
Use Figure 24 to correctly size vent pipe diameter.
Figure 24.
045, 070,
090, 110,
135
Standard or
Concentric?
See Table 3
Intake or
Exhaust?
2”, 2-1/2”
or 3”
Furnace capacity?
1
Which termination?
2
Which needs most
elbows?
3
How many?
4
Desired pipe size?
5
What is the altitude?
6
Use Table 5 or
Table 6 to find max
pipe length.
7