Lennox ELITE Series Installation Instructions Manual page 18

*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 81
2 76
3 71
4 66
5 61
6 56
7 51
8 46
9 41
10 36
Number Of
90° Elbows
Used
045
1 81
2 76
3 71
4 66
5 61
6 56
7 51
8 46
9 41
10 36
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Maximum Allowable Intake or Exhaust Vent Length in Feet
Standard Termination at Elevation 0 − 4500 ft
2" Pipe
Model
070 090 110 135
66 44 24
61 39 19
56 34 14
51 29
46 24
n/a
41 19
36 14 n/a
31
26
n/a
21
Standard Termination Elevation 4500 − 10,000 ft
2" Pipe
Model
070 090 110 135
66 44
61 39
56 34
51 29
46 24
n/a n/a
41 19
36 14
31
26 n/a
21
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TABLE 5
2−1/2" Pipe
Model
045 070 090 110
115 115 93 58
110 110 88 53
105 105 83 48
100 100 78 43
95 95 73 38
90 90 68 33
85 85 63 28
80 80 58 23
75 75 53 18
70 70 48 13
2−1/2" Pipe
Model
045 070 090 110
115 115 93 58
110 110 88 53
105 105 83 48
100 100 78 43
95 95 73 38
90 90 68 33
85 85 63 28
80 80 58 23
75 75 53 18
70 70 48 13
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3" Pipe
Model
135 045 070 090
138 137 118
133 132 113
128 127 108
123 122 103
118 117 98
n/a
113 112 93
108 107 88
103 102 83
98 97 78
93 92 73
3" Pipe
Model
135 045 070 090
138 137 118
133 132 113
128 127 108
123 122 103
118 117 98
n/a
113 112 93
108 107 88
103 102 83
98 97 78
93 92 73
110 135
118 114
113 109
108 104
103 99
98 94
93 89
88 84
83 79
78 74
73 69
110 135
118 114
113 109
108 104
103 99
98 94
93 89
88 84
83 79
78 74
73 69