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

507404-02Page 20 of 80 Issue 1448
*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.
Maximum Allowable Intake or Exhaust Vent Length in Feet
Table 5B
Concentric 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 68 53 37 17 n/a 100 100 84 49 n/a 116 116 109 109 100
2 63 48 32 12 95 95 79 44 111 111 104 104 95
3 58 43 27 7 90 90 74 39 106 106 99 99 90
4 53 38 22 n/a 85 85 69 34 101 101 94 94 85
5 48 33 17 80 80 64 29 96 96 89 89 80
6 43 28 12 75 75 59 24 91 91 84 84 75
7 38 23 7 70 70 54 19 86 86 79 79 70
8 33 18 n/a 65 65 49 14 81 81 74 74 65
9 28 13 60 60 44 9 76 76 69 69 60
10 23 8 55 55 39 n/a 71 71 64 64 55
Concentric Termination Elevation 4501 - 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 68 53 37 n/a n/a 100 100 84 49 n/a 116 116 109 109 100
2 63 48 32 95 95 79 44 111 111 104 104 95
3 58 43 27 90 90 74 39 106 106 99 99 90
4 53 38 22 85 85 69 34 101 101 94 94 85
5 48 33 17 80 80 64 29 96 96 89 89 80
6 43 28 12 75 75 59 24 91 91 84 84 75
7 38 23 7 70 70 54 19 86 86 79 79 70
8 33 18 n/a 65 65 49 14 81 81 74 74 65
9 28 13 60 60 44 9 76 76 69 69 60
10 23 8 55 55 39 n/a 71 71 64 64 55