Lennox SIGNATURE SLP99DFV 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
Used
1 15
2 10
3
4
5
N/A
6
N/A
7
8
9
10
Number 1-1/2" Pipe
Model
of 90̊
Elbows
070 090
Used
1 13
2 8
3
4
5
N/A
6
N/A
7
8
9
10
Number 1-1/2 Pipe
of 90̊ Model
Elbows
070 090
Used
1
2
3
4
5
N/A N/A
6
7
8
9
10
NOTE - Table 8 continued on next page with concentric terminations.
Maximum Allowable Intake or Exhaust Vent Length in Feet
Standard Termination at Elevation 0 - 4500'
2" Pipe
Model
110 070 090
91 69
86 64
81 59
76 54
71 49
N/A
66 44
61 39
56 34
51 29
46 24
Standard Termination at Elevation 4501' - 7500'
2" Pipe
Model
110 070 090
66 69
61 64
56 59
51 54
46 49
N/A
41 44
36 39
34
31
29
26
24
21
Standard Termination 7501' - 10,000"
2" Pipe
Model
110 070 090
41 44
36 39
31 34
26 29
21 24
N/A
16 19
11 14
N/A N/A
TABLE 8
2-1/2" Pipe
Model
110 070 090
14 140 93
9 135 88
130 83
125 78
120 73
115 68
N/A
110 63
105 58
100 53
95 48
2-1/2" Pipe
Model
110 070 090
14 115 93
9 110 88
105 83
100 78
95 73
90 68
N/A
85 63
80 58
75 53
70 48
2-1/2" Pipe
Model
110 070 090
90 68
85 63
80 58
75 53
70 48
N/A
65 43
60 38
55 33
50 28
45 23
Page 17
3" Pipe
Model
110 070 090
43 162 143
38 157 138
33 152 133
28 147 128
23 142 123
18 137 118
13 132 113
127 108
N/A 122 103
117 98
3" Pipe
Model
110 070 090
43 137 143
38 132 138
127 133
33
122 128
28
23 117 123
18 112 118
107 113
13
102 108
97 103
92 98
3" Pipe
Model
110 070 090
112 118
107 113
102 108
97 103
92 98
N/A
87 93
82 88
77 83
72 78
67 73
110
118
113
108
103
98
93
88
83
78
73
110
118
113
108
103
98
93
88
83
78
73
110
93
88
83
78
73
68
63
58
53
48