TABLE 14
Maximum Allowable Exhaust Vent Lengths With Furnace Installed in a Closet or Basement Using Ventilated
Attic or Crawl Space For Intake Air in Feet
Standard Termination at Elevation 0 - 4500 ft
1-1/2” Pipe 2” Pipe 2-1/2” Pipe 3” Pipe
Model Model Model Model
030 045 070 090 110
030
045
070 090 110
030
045
070 090 110
030
045
070 090 110
1
66 9
61
19
6 9
9 16
11
Standard Termination Elevation 4500 - 10,000 ft
1-1/2” 2” Pipe 2-1/2” Pipe 3” Pipe
Model Model Model Model
030 045 070 090 110
030
045
070 090 110
030
045
070 090 110
030
045
070 090 110
1
66
61
19
6 9
9 16
11