Lennox A97DF2E Installation Instructions Manual page 17

1-1/2" Pipe
Number
of 90°
Model
Elbows
45 70
Used
1 20 15
2 15 10
3 10
4
5
6
n/a
7 n/a
8
9
10
1-1/2" Pipe
Number
of 90°
Model
Elbows
45 70
Used
1 20 15
2 15 10
3 10
4
5
6
n/a
7 n/a
8
9
10
*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.
508391-01
Maximum Allowable Intake or Exhaust Vent Length (feet)
Standard Termination at Elevation 0 - 4,500 ft
2" Pipe
Model
90 110 45 70
66 51
61 46
56 41
51 36
46 31
n/a n/a
41 26
36 21
31 16
26 11
21 6
Standard Termination at Elevation 4,501 - 10,000 ft
2" Pipe
Model
90 110 45 70
66 51
61 46
56 41
51 36
46 31
n/a n/a
41 26
36 21
31 16
26 11
21 n/a
2-1/2" Pipe
Model
90 110 45 70
29 9 100 100
24 95 95
19 90 90
14 85 85
9 80 80
n/a 75 75
70 70
n/a 65 65
60 60
55 55
2-1/2" Pipe
Model
90 110 45 70
29 100 100
24 95 95
19 90 90
14 85 85
9 80 80
n/a
75 75
70 70
n/a 65 65
60 60
55 55
Table 7A.
Issue 2327
3" Pipe
Model
90 110 45 70
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 89 87
38 83 82
n/a
33 78 77
3" Pipe
Model
90 110 45 70
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 89 87
38 83 82
n/a
33 78 77
90 110
103 103
98 98
93 93
88 88
83 83
78 78
73 73
68 68
63 63
58 58
90 110
103 103
98 98
93 93
88 88
83 83
78 78
73 73
68 68
63 63
58 58
Page 17 of 52