Lennox A98USMV Installation Instructions Manual page 17

1-1/2" Pipe
Number of
Model
90° Elbows
Used
070 090
1 20
2 15
3 10
4
5
n/a
6
7 n/a
8
9
10
1-1/2" Pipe
Number of
Model
90° Elbows
Used
070 090
1 12
2 7
3
4
5
n/a
6
n/a
7
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.
508364-01
Maximum Allowable Intake or Exhaust Vent Length (feet)
Standard Termination at Elevation 0 - 4,500 ft
2" Pipe
Model
110 135 070 090
86 64
81 59
76 54
71 49
66 44
n/a n/a
61 39
56 34
51 29
46 24
41 19
Standard Termination at Elevation 4,501 - 10,000 ft
2" Pipe
Model
110 135 070 090
61 39
56 34
51 29
46 24
41 19
n/a n/a
36 14
31 9
26
21 n/a
16
2-1/2" Pipe
Model
110 135 070 090
135 88
130 83
125 78
120 73
115 68
n/a n/a
110 63
105 58
100 53
95 48
90 43
2-1/2" Pipe
Model
110 135 070 090
110 63
105 58
100 53
95 48
90 43
n/a n/a
85 38
80 33
75 28
70 23
65 18
Table 6A.
Issue 2346
3" Pipe
Model
110 135 070 090
38 157 138
33 152 133
28 147 128
23 142 123
18 137 118
n/a
13 132 113
8 127 108
122 103
n/a 117 98
112 93
3" Pipe
Model
110 135 070 090
132 113
127 108
122 103
117 98
112 93
n/a n/a
107 88
102 83
97 78
92 73
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
88 84
83 79
78 74
73 69
68 64
63 59
58 54
53 49
48 44
43 39
Page 17 of 74