TABLE 12 Continued
Maximum Allowable Intake or Exhaust Vent Length 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.
Concentric 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
116 116
111 111
99 99
69
6 96 96
91 91
19
9
69 69
Concentric Termination Elevation 4500 - 10,000 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
116 116
111 111
99 99
69
6 96 96
91 91
19
9
69 69
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