Lennox 97G2UHV Installation Instructions Manual page 19

1-1/2" Pipe
Number
of 90°
Capacity
Elbows
Used 45 70 90
1 25 20
2 20 15
3 15 10
4 10
5
n/a
6
7
n/a
n/a
8
9
10
1-1/2" Pipe
Number
of 90°
Capacity
Elbows
Used
45 70 90
1 25 20
2 20 15
3 15 10
4 10
5
n/a
6
7 n/a
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.
508404-01
Maximum Allowable Intake or Exhaust Vent Length in Feet
Standard Termination at Elevation 0 - 4,500 ft
2" Pipe
Capacity
110 135 45 70 90
76 61 39
71 56 34
66 51 29
61 46 24
56 41 19
n/a n/a
51 36 14
46 31 9
41 26
36 21
n/a
31 16
Standard Termination Elevation 4,501 - 10,000 ft
2" Pipe
Capacity
110 135 45 70 90
76 61 39
71 56 34
66 51 29
61 46 24
56 41 19
n/a n/a
51 36 14
46 31 9
41 26
36 21 n/a
31 16
2-1/2" Pipe
Capacity
110 135 45 70 90
19 110 110 88
14 105 105 83
9 100 100 78
95 95 73
90 90 68
n/a
85 85 63
80 80 58
n/a
75 75 53
70 70 48
65 65 43
2-1/2" Pipe
Capacity
110 135 45 70 90
110 110 88
105 105 83
100 100 78
95 95 73
90 90 68
n/a n/a
85 85 63
80 80 58
75 75 53
70 70 48
65 65 43
Table 5A.
Issue 2332
3" Pipe
Capacity
110 135 45 70 90
53 133 132 113
48 128 127 108
43 123 122 103
38 118 117 98
33 113 112 93
n/a
28 108 107 88
23 103 102 83
18 98 97 78
13 93 92 73
8 88 87 68
3" Pipe
Capacity
110 135 45 70 90
53 133 132 113
48 128 127 108
43 123 122 103
38 118 117 98
33 113 112 93
n/a
28 108 107 88
23 103 102 83
18 98 97 78
13 93 92 73
8 88 87 68
110 135
113 109
108 104
103 99
98 94
93 89
88 84
83 79
78 74
73 69
68 64
110 135
113 109
108 104
103 99
98 94
93 89
88 84
83 79
78 74
73 69
68 64
Page 19 of 60