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Capacity
045, 070, 090
* Any approved termination may be added to the minimum
length listed.
Table 6. Minimum Vent Pipe Length
IMPORTANT
Do not use screens or perforated metal in exhaust or
intake terminations. Doing so will cause freeze-ups and
may block the terminations.
Page 16 of 55
Min. Vent Length*
15 ft. or
5 ft. plus 2 elbows or
10 ft. plus 1 elbow
Issue 2223
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 21.
045, 070,
090
Standard or
Concentric?
See Table 5
Intake or
Exhaust?
1-1/2", 2",
2-1/2", or 3"
507769-05G / 31-5000656
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