Lennox ELITE EL195UHE 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
Used
045 070
1 71 56
2 66 51
3 61 46
4 56 41
5 51 36
6 46 31
7 41 26
8 36 21
9 31 16
10 26 11
Number Of
90° Elbows
Used
045 070
1 71 56
2 66 51
3 61 46
4 56 41
5 51 36
6 46 31
7 41 26
8 36 21
9 31 16
10 26 11
Attic or Crawl Space For Intake Air in Feet
Standard Termination at Elevation 0 - 4500 ft
2" Pipe
Model
090 110 135 045
34 14 100
29 9 95
24 4 90
19 85
14 80
n/a
9 85
4 70
n/a
65
n/a 60
55
Standard Termination Elevation 4500 - 10,000 ft
2" Pipe
Model
090 110 135 045
34 100
29 95
24 90
19 85
14 80
n/a n/a
9 85
4 70
65
n/a 60
55
TABLE 6
2-1/2" Pipe
Model
070 090 110
100 78 43
95 73 38
90 68 33
85 63 28
80 58 23
75 63 18
70 48 13
65 43 8
60 38 3
55 33 n/a
2-1/2" Pipe
Model
070 090 110
100 78 43
95 73 38
90 68 33
85 63 28
80 58 23
85 53 18
70 48 13
65 43 8
60 38 3
55 33 n/a
Page 21
3" Pipe
Model
135 045 070 090
118 117 98
113 112 93
108 107 88
103 102 83
98 97 78
n/a
93 92 73
88 87 68
83 82 63
78 77 58
73 72 53
3" Pipe
Model
135 045 070 090
118 117 98
113 112 93
118 107 88
113 102 83
98 97 78
n/a
93 92 73
98 87 68
93 82 63
78 77 58
73 72 53
110 135
98 94
93 89
88 84
83 79
78 74
73 69
68 64
63 59
58 54
53 49
110 135
98 94
93 89
88 84
83 79
78 74
73 69
68 64
63 59
58 54
53 49