MrCool Signature Series - Vent Sizing; Vent Sizing Flowchart

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IMPORTANT
Capacity Min. Vent Length*
135 **
Table 4.
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 to find
max pipe length.
7
Figure 24.