507769C05 Page 17 of 55
Maximum Allowable Intake or Exhaust Vent Length in Feet
Standard Termination at Elevation 0 - 2,000 ft
Number of
90° Elbows
Used
1-1/2” Pipe 2” Pipe 2-1/2" Pipe 3" Pipe
Capacity Capacity Capacity Capacity
045 070 090 110 045 070 090 110 045 070 090 110 045 070 090 110
1 15 15
n/a n/a
61 46 24
n/a
100 80 43
n/a
127 127 108 108
2 10 10 56 41 19 95 75 38 122 122 103 103
3
n/a n/a
51 36 14 90 70 33 117 117 98 98
4 46 31
n/a
85 65 28 112 112 93 93
5 41 26 80 60 23 107 107 88 88
6 36 21 75 55 18 102 102 83 83
7 31 16 70 50 13 97 97 78 78
8 26 11 65 45
n/a
92 92 73 73
9 21
n/a
60 40 87 87 68 68
10 16 55 35 82 82 63 63
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.
Table 7A.
Maximum Allowable Intake or Exhaust Vent Length in Feet
Standard Termination at Elevation 2,001 - 10,000 ft
Number of 90°
Elbows Used
2” Pipe 2-1/2" Pipe 3" Pipe
Capacity Capacity Capacity
045 070 090 110 045 070 090 110 045 070 090 110
1 35 25 15
n/a
100 73 43
n/a
127 127 108 108
2 30 20 10 95 68 38 122 122 103 103
3 25 15
n/a
90 63 33 117 117 98 98
4 20 10 85 58 28 112 112 93 93
5 15
n/a
80 53 23 107 107 88 88
6 10 75 48 18 102 102 83 83
7
n/a
70 43 13 97 97 78 78
8 65 38
n/a
92 92 73 73
9 60 33 87 87 68 68
10 55 28 82 82 63 63
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.
Table 7B.
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