Lennox EL195UHNE Installation Instructions Manual page 21

Maximum Allowable Exhaust Vent Lengths With Furnace Installed in a Closet or Basement Using Ventilated
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 Of
90° Elbows
040
1 71
2 66
3 61
4 56
5 51
6 46
7 41
8 36
9 31
10 26
Number Of
90° Elbows
040
1 71
2 66
3 61
4 56
5 51
6 46
7 41
8 36
9 31
10 26
TABLE 6
Attic or Crawl Space For Intake Air in Feet
Standard Termination at Elevation 0 - 4500 ft
2" Pipe
Model
060 080
56 34
51 29
46 24
41 19
36 14
31 9
26 4
21
16 n/a
11
Standard Termination at Elevation 4501 - 7500 ft
2" Pipe
Model
060 080
31 24
26 19
21 14
16 9
11
n/a
n/a
100 040
14 118
9 113
4 108
103
98
93
n/a 88
83
78
73
100 040
118
113
108
103
98
n/a
93
88
83
78
73
Page 21
3" Pipe
Model
060 080
117 98
112 93
107 88
102 83
97 78
92 73
87 68
82 63
77 58
72 53
3" Pipe
Model
060 080
85 80
80 75
75 70
70 65
65 60
60 55
55 50
50 45
45 40
40 35
100
98
93
88
83
78
73
68
63
58
53
100
45
40
35
30
25
20
15
10
n/a