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TABLE 5 Continued
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 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