Installation Guide

507277-03C Page 15 of 53mrcool.com
CAUTION
CAUTION
Vent Piping Guidelines
NOTE: In non-Direct Vent installations, combustion air is
In Direct Vent installations, combustion air is taken from
Table 6. Minimum Vent Pipe Length
Capacity Min. Vent Length*
045, 070, 090, 110
IMPORTANT
Figure 21.
045, 070,
090, 110
Standard or
Concentric?
See Table 5
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 7 to find
max pipe length.
7