TABLE 13 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 - 2000 ft
1-1/2” Pipe 2” Pipe 2-1/2” Pipe 3” Pipe
Model Model Model Model
030 045 070 090 110 135
030
045
070 090 110 135
030
045
070 090 110 135
030
045
070 090 110 135
1
116 116
111 111
99 99
69
6 96 96
91 91
19
9
69 69
Concentric Termination at Elevation 2001 - 10,000 ft
2” Pipe 2-1/2” Pipe 3” Pipe
Model Model Model
030
045
070 090 110 135
030
045
070 090 110 135
030
045
070 090 110 135
1
96
91 116 116
111 111
99 99
6
96 96
66
91 91
61
9
69 69
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