Lennox ML196UHE 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.
NOTE - additional vent pipe and elbows used to terminate the vent pipe outside the structure must be included
in the total vent length calculation.
1-1/2" Pipe
No.
Model
90° El-
bows
030 045 070 090 110
1 20 15 10
2 15 10
3 10
4
5
n/a
6 n/a
n/a
7 n/a
8
9
10
1-1/2" Pipe
No.
Model
90° El-
bows
030 045 070 090 110
1 20 15 10
2 15 10
3 10
4
5
n/a
6 n/a
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
030
135 070
045
73 58
68 53
63 48
58 43
53 38
n/a n/a
48 33
43 28
38 23
33 18
28 13
Concentric Termination Elevation 4500 - 10,000 ft
2" Pipe
Model
030
135 070
045
73 58
68 53
63 48
58 43
53 38
n/a n/a
48 33
43 28
38 23
33 18
28 13
2-1/2" Pipe
030
090 110 135 070
045
42 22 105 105
37 17 100 100
32 12 95 95
27 90 90
22 85 85
n/a
17 80 80
12 n/a 75 75
70 70
n/a 65 65
60 60
2-1/2" Pipe
030
090 110 135 070
045
42 105 105
37 100 100
32 95 95
27 90 90
22 85 85
n/a n/a
17 80 80
12 75 75
70 70
n/a 65 65
60 60
Page 20
Model
030
090 110 135 070 090
045
89 54 121 121
84 49 116 116
79 44 111 111
74 39 106 106
69 34 101 101
n/a
64 29 96
59 24 91
54 19 86
49 14 81
44 n/a 76
Model
030
090 110 135 070 090
045
89 54 121 121
84 49 116 116
79 44 111 111
74 39 106 106
69 34 101 101
n/a
64 29 96
59 24 91
54 19 86
49 14 81
44 n/a 76
3" Pipe
Model
110 135
114 114 70
109 109 65
104 104 60
99 99 55
94 94 50
96 89 89 45
91 84 84 40
86 79 79 35
81 74 74 30
76 69 69 25
3" Pipe
Model
110 135
114 114 70
109 109 65
104 104 60
99 99 55
94 94 50
96 89 89 45
91 84 84 40
86 79 79 35
81 74 74 30
76 69 69 25