507867-02
Page 18 of 55
Issue 1933
Do not use screens or perforated metal in exhaust or
intake terminations. Doing so will cause freeze-ups and
may block the terminations.
IMPORTANT
Use Figure 24 to correctly size vent pipe diameter.
030, 045,
070, 090,
110
Standard or
Concentric?
See Table 3
Intake or
Exhaust?
1-1/2”,
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
Figure 24.
