Page 40
TABLE 22
Maximum Allowable Exhaust Vent Lengths With Furnace Installed in a
Closet or Basement Using VentilatedAttic or Crawl Space For Intake Air in Feet
NOTE - Size intake and exhaust pipe length separately. Values in table are for Intake OR Exhaust, not combined total. Both Intake
and Exhaust must be same pipe size.
NOTE - Additional vent pipe and elbows used to terminate the vent pipe outside the structure must be included in the total vent length
calculation
.
Standard Termination at Elevation 0 - 4500 ft
Number Of 90°
Elbows Used
2” Pipe 3” Pipe
Model Model
040 060 080 040 060 080
1 71 117
2 29 112
24 107
4 41 19 102
14 97
9 92
7 41 4
21
9 77
10 11 72
Standard Termination at Elevation 4501 - 6000 ft
Number Of 90°
Elbows Used
2” Pipe 3” Pipe
Model Model
040 060 080 040 060 080
1 71 24
2 19
21 14 70
4 9 70
11
7 41
9 40
10 40
Standard Termination at Elevation 6001 - 7500 ft
Number Of 90°
Elbows Used
2” Pipe 3” Pipe
Model Model
040 060 080 040 060 080
1 71 19 14
2 14 9
9
70
4
70
7 41
9 40
10 40
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