Lennox ELITE Series Installation Instructions Manual page 19

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