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TABLE 7
Maximum Allowable Intake or Exhaust Vent Length in Feet
*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.
Concentric Termination at Elevation 0 − 4500’
Number Of
90° Elbows
Used
2" Pipe 2−1/2" Pipe 3" Pipe
Model Model Model
070 090 110 070 090 110 070 090 110
1 83 67 12 130 89 39 146 139 114
2 78 62 7 125 84 34 141 134 109
3 73 57
n/a
120 79 29 136 129 104
4 68 52 115 74 24 131 124 99
5 63 47 110 69 19 126 119 94
6 58 42 105 64 14 121 114 89
7 53 37 100 59
n/a
116 109 84
8 48 32 95 54 111 104 79
9 43 27 90 49 106 99 74
10 38 22 85 44 101 94 69
Concentric Termination Elevation 4501’ − 7500’
Number Of
90° Elbows
Used
2" Pipe 2−1/2" Pipe 3" Pipe
Model Model Model
070 090 110 070 090 110 070 090 110
1 58 67 12 105 89 39 121 114 114
2 53 62 7 100 84 34 116 109 109
3 48 57
n/a
95 79 29 111 104 104
4 43 52 90 74 24 106 99 99
5 38 47 85 69 19 101 94 94
6 33 42 80 64 14 96 89 89
7 28 37 75 59
n/a
91 84 84
8 23 32 70 54 86 79 79
9 18 27 65 49 81 74 74
10 13 22 60 44 76 69 69
Concentric Terminatioin at Elevation 7501’ − 10,000’’
Number Of
90° Elbows
Used
2" Pipe 2−1/2" Pipe 3" Pipe
Model Model Model
070 090 110 070 090 110 070 090 110
1 33 42
n/a
80 64
n/a
96 114 89
2 28 37 75 59 91 109 84
3 23 32 70 54 86 104 79
4 18 27 65 49 81 99 74
5 13 22 60 44 76 94 69
6
n/a
17 55 39 71 89 64
7 12 50 34 66 84 59
8
n/a
45 29 61 79 54
9 40 24 56 74 49
10 35 19 51 69 44