Lennox SIGNATURE SLP99UHV070XV36B Installation Instructions Manual page 17

*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.
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 90̊ ̊
Model
Elbows
070 090 110 135
Used
1
20
2
15
3
10
4
5
N/A N/A N/A
6
7
N/A
8
9
10
Number
1-1/2" Pipe
of 90̊
Model
Elbows
070 090 110 135
Used
1
12
2
7
3
4
5
N/A N/A N/A
6
N/A
7
8
9
10
Maximum Allowable Intake or Exhaust Vent Length in Feet
Standard Termination at Elevation 0 - 7500'
2" Pipe
Model
070 090 110 135
91 69 14
86 64 9
81 59
76 54
71 49
66 44
N/A
61 39
56 34
51 29
46 24
Standard Termination at Elevation 7501' - 10,000'
2" Pipe
Model
070 090 110 135
66 44
61 39
56 34
51 29
46 24
N/A N/A
41 19
36 14
31
26 N/A
21
TABLE 8
2-1/2" Pipe
Model
070 090
140 93
135 88
130 83
125 78
120 73
N/A
115 68
110 63
105 58
100 53
95 48
2-1/2" Pipe
Model
070 090
115 68
110 63
105 58
100 53
95 48
90 43
85 38
80 33
75 28
70 23
Page 17
3" Pipe
Model
110 135 070 090
43 162 143
38 157 138
33 152 133
28 147 128
23 142 123
N/A
18 137 118
13 132 113
127 108
N/A 122 103
117 98
3" Pipe
Model
110 135 070 090
137 118
132 113
127 108
122 103
117 96
N/A N/A
112 93
107 88
102 83
97 78
92 73
110 135
118 114
113 109
108 104
103 99
98 94
93 89
88 84
83 79
78 74
73 69
110 135
93 89
88 84
83 79
78 74
73 69
68 64
63 59
58 54
53 49
48 44