508433-01 Issue 2345 Page 31 of 70
Use the following steps 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 13A
through Table 13C to
find max pipe length.
7
Figure 18. Vent Pipe Diameter Sizing
Figure 17.
Capacity Min. Vent Length*
030, 045, 070, 090, 110
15 ft or 5 ft plus 2 elbows or
10 ft plus 1 elbow
*Any approved termination may be added to the minimum
length listed.
** This gas furnace must have 3” to 2” reducing elbow
(supplied or eld replacement Canadian kit) installed directly.
Table 12. Minimum Vent Pipe Lengths
Do not use screens or perforated metal in exhaust or
intake terminations. Doing so will cause freeze-ups and
may block the terminations.
IMPORTANT
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