Allied A96US2V - Maximum Vent Pipe Lengths (Intake;Exhaust)

507404-02 Page 19 of 80Issue 1448
Maximum Allowable Intake or Exhaust Vent Length in Feet
Table 5A
*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.
Standard Termination at Elevation 0 - 4500 
Number of
90° Elbows
Used
2" Pipe 2-1/2" Pipe 3" Pipe
Model Model Model
45 70 90 110 135 45 70 90 110 135 45 70 90 110 135
1 76 61 39 19 n/a 110 110 88 53 n/a 133 132 113 113 109
2 71 56 34 14 105 105 83 48 128 127 108 108 104
3 66 51 29 9 100 100 78 43 123 122 103 103 99
4 61 46 24 n/a 95 95 73 38 118 117 98 98 94
5 56 41 19 90 90 68 33 113 112 93 93 89
6 5 36 14 85 85 63 28 108 107 88 88 84
7 46 31 9 80 80 58 23 103 102 83 83 79
8 41 26 n/a 75 75 53 18 98 97 78 78 74
9 36 21 70 70 48 13 93 92 73 73 69
10 31 16 65 65 43 8 88 87 68 68 64
Standard Termination Elevation 4500 - 10,000 
Number of
90° Elbows
Used
2" Pipe 2-1/2" Pipe 3" Pipe
Model Model Model
45 70 90 110 135 45 70 90 110 135 45 70 90 110 135
1 76 61 39 n/a n/a 110 110 88 53 n/a 133 132 113 113 109
2 71 56 34 105 105 83 48 128 127 108 108 104
3 66 51 29 100 100 78 43 123 122 103 103 99
4 61 46 24 95 95 73 38 118 117 98 98 94
5 56 41 19 90 90 68 33 113 112 93 93 89
6 5 36 14 85 85 63 28 108 107 88 88 84
7 46 31 9 80 80 58 23 103 102 83 83 79
8 41 26 n/a 75 75 53 18 98 97 78 78 74
9 36 21 70 70 48 13 93 92 73 73 69
10 31 16 65 65 43 8 88 87 68 68 64