Allied A96UH1E - Concentric Termination Vent Lengths; Table 5 C. Maximum Allowable Intake or Exhaust Vent Length in Feet; Table 5 D.

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Maximum Allowable Intake or Exhaust Vent Length in Feet
Concentric Termination at Elevation 0 - 2,000 ft
Number
of 90°
Elbows
Used
1-1/2” Pipe 2” Pipe 2-1/2" Pipe 3" Pipe
Capacity Capacity Capacity Capacity
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
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.
NOTE - Contact your local FTC if more than 85ft of venting is needed.
Table 5C.
Maximum Allowable Intake or Exhaust Vent Length in Feet
Concentric Termination at Elevation 2,001 - 10,000 ft
Number of
90° Elbows
Used
2” Pipe 2-1/2" Pipe 3" Pipe
Capacity Capacity Capacity
030/
045
070 090 110 135
030/
045
070 090 110 135
030/
045
070 090 110 135
1 73 30 15
n/a n/a
105 96 53 38
n/a
121 121 114 114 70
2 68 25 10 100 91 48 33 116 116 109 109 65
3 63 20
n/a
95 86 43 28 111 111 104 104 60
4 58 15 90 81 38 23 106 106 99 99 55
5 53 10 85 76 33 18 101 101 94 94 50
6 48
n/a
80 71 28 13 96 96 89 89 45
7 43 75 66 23
n/a
91 91 84 84 40
8 38 70 61 18 86 86 79 79 35
9 33 65 56 13 81 81 74 74 30
10 28 60 51 n/a 76 76 69 69 25
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.
NOTE - Contact your local FTC if more than 85ft of venting is needed.
Table 5D.