Lennox ELITE EL296DFE Installation Instructions Manual page 20

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 15 10
2 10
3
4
5
6 n/a
n/a
7
8
9
10
Number 1-1/2" Pipe
Of 90°
Model
Elbows
045 070
Used
1 15 10
2 10
3
4
5
6
n/a
n/a
7
8
9
10
Maximum Allowable Exhaust Vent Length Using Ventilated Attic or Crawl Space For Intake Air in Feet
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 15 10
2 10
3
4
5
n/a
6
n/a
7
8
9
10
Maximum Allowable Intake or Exhaust Vent Length
Concentric Termination at Elevation 0 - 4500 ft
2" Pipe
Model
090 110 045 070
63 48
58 43
53 38
48 33
43 28
n/a n/a
38 23
33 18
28 13
23 8
18 3
Concentric Termination Elevation 4501 - 10,000 ft
2" Pipe
Model
090 110 045 070
63 48
58 43
53 38
48 33
43 28
n/a n/a
38 23
33 18
28 13
23 8
18 3
Standard Termination at Elevation 0 - 10,000 ft
2" Pipe
Model
090 110 045 070
61 46
56 41
51 36
46 31
41 26
n/a n/a
36 21
31 16
26 11
21 6
16 1
TABLE 7 Continued
090 110 045
32 12 95
27 7 90
22 2 85
17 80
12 75
7 70
2 n/a 65
60
n/a 55
50
090 110 045
32 95
27 90
22 85
17 80
12 75
n/a
7 70
2 65
60
n/a 55
50
TABLE 8
090 110 045 070
24 90
19 85
14 80
9 75
4 70
n/a
65
60
n/a 55
50
45
Page 20
2-1/2" Pipe
Model
070 090 110 045
95 79 44 111
90 74 39 106
85 69 34 101
80 64 29 96
75 59 24 91
70 54 19 86
65 49 14 81
60 44 9 76
55 39 4 71
50 34 n/a 66
2-1/2" Pipe
Model
070 090 110 045
95 79 44 111
90 74 39 106
85 69 34 101
80 64 29 96
75 59 24 91
70 54 19 86
65 49 14 81
60 44 9 76
55 39 4 71
50 34 n/a 66
2-1/2" Pipe
Model
090 110 045
90 68 33 108
85 63 28 103
80 58 23 98
75 53 18 93
70 48 13 88
65 43 8 81
60 38 3 78
55 33 73
50 28 n/a 68
45 23 63
3" Pipe
Model
070 090 110
111 104 104
106 99 99
101 94 94
96 89 89
91 84 84
86 79 79
81 74 74
76 69 69
71 64 64
66 59 59
3" Pipe
Model
070 090 110
111 104 94
106 99 99
101 94 94
96 89 89
91 84 84
86 79 79
81 74 74
76 69 69
71 64 64
66 59 59
3" Pipe
Model
070 090 110
107 88 88
102 83 83
97 78 78
92 73 73
87 68 68
82 63 63
77 58 58
72 53 53
67 48 48
62 43 43