Lennox SIGNATURE SLP99DFV Installation Instructions Manual page 18

*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.
Number 1-1/2" Pipe
Of 90̊ ̊
Model
Elbows
070 090
Used
1 10
2
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
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
Maximum Allowable Intake or Exhaust Vent Length in Feet
Concentric Termination at Elevation 0 - 4500'
2" Pipe
Model
110 070 090
83 67
78 62
73 57
68 52
63 47
N/A
58 42
53 37
48 32
43 27
38 22
Concentric Termination at Elevation 4501' - 7500'
2" Pipe
Model
110 070 090
58 67
53 62
48 57
43 52
38 47
N/A
33 42
28 37
32
23
27
18
22
13
Concentric Termination 7501' - 10,000"
2" Pipe
Model
110 070 090
33 42
28 37
23 32
18 27
13 22
N/A
17
12
N/A
N/A
TABLE 8
2-1/2" Pipe
Model
110 070 090
12 130 89
7 125 84
120 79
115 74
110 69
105 64
N/A
100 59
95 54
90 49
85 44
2-1/2" Pipe
Model
110 070 090
12 105 89
7 100 84
95 79
90 74
85 69
80 64
N/A
75 59
70 54
65 49
60 44
2-1/2" Pipe
Model
110 070 090
80 64
75 59
70 54
65 49
60 44
N/A
55 39
50 34
45 29
40 24
35 19
Page 18
3" Pipe
Model
110 070 090
39 146 139
34 141 134
29 136 129
24 131 124
19 126 119
14 121 114
116 109
111 104
N/A
106 99
101 94
3" Pipe
Model
110 070 090
39 121 114
34 116 109
111 104
29
24 106 99
19 101 94
14 96 89
91 84
86 79
N/A
81 74
76 69
3" Pipe
Model
110 070 090
96 114
91 109
86 104
81 99
76 94
N/A
71 89
66 84
61 79
56 74
51 69
110
114
109
104
99
94
89
84
79
74
69
110
114
109
104
99
94
89
84
79
74
69
110
89
84
79
74
69
64
59
54
49
44