Lennox ELITE Series Installation Instructions Manual page 19

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