Lennox ELITE Series Installation Instructions Manual page 20

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.
No Of 1-1/2" Pipe
90°
Model
Elbows
045 070 090
Used
1 20 15
2 15 10
3 10
4
5
n/a
6
n/a
7 n/a
8
9
10
No Of 1-1/2" Pipe
90°
Model
Elbows
045 070 090
Used
1 20 15
2 15 10
3 10
4
5
n/a
6
n/a
7 n/a
8
9
10
TABLE 5 Continued
Maximum Allowable Intake or Exhaust Vent Length in Feet
Concentric Termination at Elevation 0 - 4500 ft
2" Pipe
Model
110 135 045 070 090
73 58 42
68 53 37
63 48 32
58 43 27
53 38 22
n/a n/a
48 33 17
43 28 12
38 23
33 18 n/a
28 13
Concentric Termination Elevation 4500 - 10,000 ft
2" Pipe
Model
110 135 045 070 090
73 58 42
68 53 37
63 48 32
58 43 27
53 38 22
n/a n/a
48 33 17
43 28 12
38 23
33 18 n/a
28 13
2-1/2" Pipe
Model
110 135 045 070 090
22 105 105 89
17 100 100 84
12 95 95 79
90 90 74
85 85 69
n/a
80 80 64
n/a 75 75 59
70 70 54
65 65 49
60 60 44
2-1/2" Pipe
Model
110 135 045 070 090
105 105 89
100 100 84
95 95 79
90 90 74
85 85 69
n/a n/a
80 80 64
75 75 59
70 70 54
65 65 49
60 60 44
Page 20
3" Pipe
Model
110 135 045 070 090
54 121 121 114
49 116 116 109 109 100
44 111 111 104 104
39 106 106 99
34 101 101 94
n/a
29 96 96 89
24 91 91 84
19 86 86 79
14 81 81 74
n/a 76 76 69
3" Pipe
Model
110 135 045 070 090
54 121 121 114
49 116 116 109 109 100
44 111 111 104 104
39 106 106 99
34 101 101 94
n/a
29 96 96 89
24 91 91 84
19 86 86 79
14 81 81 74
n/a 76 76 69
110 135
114 105
95
99 90
94 85
89 80
84 75
79 70
74 65
69 60
110 135
114 105
95
99 90
94 85
89 80
84 75
79 70
74 65
69 60