Lennox EL195UH040NE36B Installation Instructions And Use page 20

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
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
100 040
14 118
9 113
4 108
103
98
93
n/a 88
83
78
73
Page 20
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
100
98
93
88
83
78
73
68
63
58
53