Page 20
TABLE 5 Continued
Maximum Allowable Intake or Exhaust Vent Length in Feet
NOTE - 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.
NOTE - additional vent pipe and elbows used to terminate the vent pipe outside the structure must be included
in the total vent length calculation.
Concentric Termination at Elevation 0 - 4500 ft
No.
90° El-
bows
1-1/2” Pipe 2” Pipe 2-1/2” Pipe 3” Pipe
Model Model Model Model
030 045 070 090 110 135
030
045
070 090 110 135
030
045
070 090 110 135
030
045
070 090 110 135
1 20 15 10
n/a n/a n/a
73 58 42 22
n/a
105 105 89 54
n/a
121 121 114 114 70
2 15 10
n/a
68 53 37 17 100 100 84 49 116 116 109 109 65
3 10
n/a
63 48 32 12 95 95 79 44 111 111 104 104 60
4
n/a
58 43 27
n/a
90 90 74 39 106 106 99 99 55
5 53 38 22 85 85 69 34 101 101 94 94 50
6 48 33 17 80 80 64 29 96 96 89 89 45
7 43 28 12 75 75 59 24 91 91 84 84 40
8 38 23
n/a
70 70 54 19 86 86 79 79 35
9 33 18 65 65 49 14 81 81 74 74 30
10 28 13 60 60 44 n/a 76 76 69 69 25
Concentric Termination Elevation 4500 - 10,000 ft
No.
90° El-
bows
1-1/2” Pipe 2” Pipe 2-1/2” Pipe 3” Pipe
Model Model Model Model
030 045 070 090 110 135
030
045
070 090 110 135
030
045
070 090 110 135
030
045
070 090 110 135
1 20 15 10
n/a n/a n/a
73 58 42
n/a n/a
105 105 89 54
n/a
121 121 114 114 70
2 15 10
n/a
68 53 37 100 100 84 49 116 116 109 109 65
3 10
n/a
63 48 32 95 95 79 44 111 111 104 104 60
4
n/a
58 43 27 90 90 74 39 106 106 99 99 55
5 53 38 22 85 85 69 34 101 101 94 94 50
6 48 33 17 80 80 64 29 96 96 89 89 45
7 43 28 12 75 75 59 24 91 91 84 84 40
8 38 23
n/a
70 70 54 19 86 86 79 79 35
9 33 18 65 65 49 14 81 81 74 74 30
10 28 13 60 60 44 n/a 76 76 69 69 25
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