Lennox ELITE EL296DFE Installation Instructions Manual page 19

Size intake and exhaust pipe length separately. Values in table are for Intake OR Exhaust, not combined total. Intake and Exhaust must be same 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 1-1/2" Pipe
Of 90°
Model
Elbows
045 070
Used
1 20 15
2 15 10
3 10
4
5
6
n/a
7 n/a
8
9
10
Number 1-1/2" Pipe
Of 90°
Model
Elbows
045 070
Used
1 20 15
2 15 10
3 10
4
5
6
n/a
7 n/a
8
9
10
Maximum Allowable Intake or Exhaust Vent Length
Standard Termination at Elevation 0 - 4500 ft
2" Pipe
Model
090 110 045 070
71 56
66 51
61 46
56 41
51 36
n/a n/a
46 31
41 26
36 21
31 16
26 11
Standard Termination Elevation 4501 - 10,000 ft
2" Pipe
Model
090 110 045 070
71 56
66 51
61 46
56 41
51 36
n/a n/a
46 31
41 26
36 21
31 16
26 11
TABLE 7
2-1/2" Pipe
Model
090 110 045 070
34 14 105 105
29 9 100 100
24 4 95 95
19 90 90
14 85 85
9 80 80
4 n/a 75 75
70 70
n/a 65 65
60 60
2-1/2" Pipe
Model
090 110 045 070
34 105 105
29 100 100
24 95 95
19 90 90
14 85 85
n/a
9 80 80
4 75 75
70 70
n/a 65 65
60 60
Page 19
3" Pipe
Model
090 110 045 070
83 48 128 127
78 43 123 122
73 38 118 117
68 33 113 112
63 28 108 107
58 23 101 102
53 18 98 97
48 13 93 92
43 8 88 87
38 3 83 82
3" Pipe
Model
090 110 045 070
83 48 128 127
78 43 123 122
73 38 118 117
68 33 113 112
63 28 108 107
58 23 103 102
53 18 98 97
48 13 93 92
43 8 87 87
38 5 83 82
090 110
108 108
103 103
98 98
93 93
88 88
83 83
78 78
73 73
68 68
63 63
090 110
108 108
103 103
98 98
93 93
88 88
83 83
78 78
73 73
68 68
63 63