Lennox EL296UHV 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.
NOTE - Additional vent pipe and elbows used to terminate the vent pipe outside the structure must be included in the total vent length calculation.
Number Of
90° Elbows
Used
045 070
1 81 66
2 76 61
3 71 56
4 66 51
5 61 46
6 56 41
7 51 36
8 46 31
9 41 26
10 36 21
Number Of
90° Elbows
Used
045 070
1 81 66
2 76 61
3 71 56
4 66 51
5 61 46
6 56 41
7 51 36
8 46 31
9 41 26
10 36 21
See concentric terminations next page.
Maximum Allowable Intake or Exhaust Vent Length in Feet
Standard Termination at Elevation 0 - 4500 ft
2" Pipe
Model
090 110 135 045
44 24 115
39 19 110
34 14 105
29 100
24 95
n/a
19 90
14 85
n/a
80
n/a 75
70
Standard Termination Elevation 4500 - 10,000 ft
2" Pipe
Model
090 110 135 045
44 115
39 110
34 105
29 100
24 95
n/a n/a
19 90
14 85
80
n/a 75
70
TABLE 5
2-1/2" Pipe
Model
070 090 110
115 93 58
110 88 53
105 83 48
100 78 43
95 73 38
90 68 33
85 63 28
80 58 23
75 53 18
70 48 13
2-1/2" Pipe
Model
070 090 110
115 93 58
110 88 53
105 83 48
100 78 43
95 73 38
90 68 33
85 63 28
80 58 23
75 53 18
70 48 13
Page 19
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