Lennox ELITE Series 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.
1-1/2" Pipe
No Of
Model
90°
Elbows
030 045 070
1 20 15 10
2 15 10
3 10
4
5
6 n/a
n/a
7 n/a
8
9
10
1-1/2"
No Of
Model
90°
Elbows
030 045 070
1 20 15 10
2 15 10
3 10
4
5
6 n/a
n/a
7 n/a
8
9
10
Attic or Crawl Space For Intake Air in Feet
Standard Termination at Elevation 0 - 4500 ft
2" Pipe
Model
030
090 110 070
045
71 56
66 51
61 46
56 41
51 36
n/a n/a
46 31
41 26
36 21
31 16
26 11
Standard Termination Elevation 4500 - 10,000 f
2" Pipe
Model
030
090 110 070
045
71 56
66 51
61 46
56 41
51 36
n/a n/a
46 31
41 26
36 21
31 16
26 11
TABLE 6
2-1/2" Pipe
030
090 110 070
045
34 14 100 100
29 9 95 95
24 4 90 90
19 85 85
14 80 80
9 75 75
4 n/a 70 70
65 65
n/a 60 60
55 55
2-1/2" Pipe
030
090 110 070
045
34 100 100
29 95 95
24 90 90
19 85 85
14 80 80
n/a
9 75 75
4 70 70
65 65
n/a 60 60
55 55
Page 21
Model
030
090 110
045
78 43 118
73 38 113
68 33 108
63 28 103
58 23 98
53 18 93
48 13 88
43 8 83
38 3 78
33 n/a 73
t
Model
030
090 110
045
78 43 118
73 38 113
68 33 108
63 28 103
58 23 98
53 18 93
48 13 88
43 8 83
38 3 78
33 n/a 73
3" Pipe
Model
070 090 110
117 98 98
112 93 93
107 88 88
102 83 83
97 78 78
92 73 73
87 68 68
82 63 63
77 58 58
72 53 53
3" Pipe
Model
070 090 110
117 98 98
112 93 93
107 88 88
102 83 83
97 78 78
92 73 73
87 68 68
82 63 63
77 58 58
72 53 53