Page 22
TABLE 12 Continued
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.
Standard Termination at Elevation 4501 - 7500 ft
Number Of
90° Elbows
2” Pipe 3” Pipe
Model Model
040 060 080 100 040 060 080 100
1 81 41 34
n/a
138 105 100 65
2 76 36 29 133 100 95 60
3 71 31 24 128 95 90 55
4 66 26 19 123 90 85 50
5 61 21 14 118 85 80 45
6 56 16 9 113 80 75 40
7 51 11
n/a
108 75 70 35
8 46
n/a
103 70 65 30
9 41 98 65 60 25
10 36 93 60 55 20
Concentric Termination at Elevation 4501 - 7500 ft
Number Of
90° Elbows
2” Pipe 3” Pipe
Model Model
040 060 080 100 040 060 080 100
1 73 33 32
n/a
121 89 89 61
2 68 28 27 116 84 84 56
3 63 23 22 111 79 79 51
4 58 18 17 106 74 74 46
5 53 13 12 101 69 69 41
6 48
n/a n/a
96 64 64 36
7 43 91 59 59 31
8 38 86 54 54 26
9 33 81 49 49 21
10 28 76 44 44 16