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TABLE 5 Continued
Maximum Allowable Vent Length in Feet
Concentric Termination at Elevation 0 − 4500 ft
Number Of
90° Elbows
Used
2" Pipe 2−1/2" Pipe 3" Pipe
Model Model Model
045 070 090 110 135 045 070 090 110 135 045 070 090 110 135
1 73 58 42 22
n/a
105 105 89 54
n/a
121 121 114 114 105
2 68 53 37 17 100 100 84 49 116 116 109 109 100
3 63 48 32 12 95 95 79 44 111 111 104 104 95
4 58 43 27
n/a
90 90 74 39 106 106 99 99 90
5 53 38 22 85 85 69 34 101 101 94 94 85
6 48 33 17 80 80 64 29 96 96 89 89 80
7 43 28 12 75 75 59 24 91 91 84 84 75
8 38 23
n/a
70 70 54 19 86 86 79 79 70
9 33 18 65 65 49 14 81 81 74 74 65
10 28 13 60 60 44 n/a 76 76 69 69 60
Concentric Termination Elevation 4501 − 10,000 ft
Number Of
90° Elbows
Used
2" Pipe 2−1/2" Pipe 3" Pipe
Model Model Model
045 070 090 110 135 045 070 090 110 135 045 070 090 110 135
1 73 58 42
n/a n/a
105 105 89 54
n/a
121 121 114 114 105
2 68 53 37 100 100 84 49 116 116 109 109 100
3 63 48 32 95 95 79 44 111 111 104 104 95
4 58 43 27 90 90 74 39 106 106 99 99 90
5 53 38 22 85 85 69 34 101 101 94 94 85
6 48 33 17 80 80 64 29 96 96 89 89 80
7 43 28 12 75 75 59 24 91 91 84 84 75
8 38 23
n/a
70 70 54 19 86 86 79 79 70
9 33 18 65 65 49 14 81 81 74 74 65
10 28 13 60 60 44 n/a 76 76 69 69 60
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