Maximum Allowable Exhaust Vent Length Using Ventilated Attic - Lennox EL296DF045XV36B Unit Information

Maximum Allowable Exhaust Vent Length Using Ventilated Attic or Crawl Space For Intake Air in Feet
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° El­
bows
045 070
Used
1 61
2 56
3 51
4 46
5 41
6 36
7 31
8 26
9 21
10 16
Standard Termination at Elevation 0 - 10,000 ft
2" Pipe
Model
090 110
46 24 4
41 19
36 14
31 9
26 4
21
n/a
16
11
n/a
6
1
TABLE 23
2-1/2" Pipe
Model
045 070 090
90 90 68
85 85 63
80 80 58
75 75 53
70 70 48
65 65 43
60 60 38
55 55 33
50 50 28
45 45 23
Page 44
3" Pipe
Model
110 045 070
33 108 107
28 103 102
23 98 97
18 93 92
13 88 87
8 81 82
3 78 77
n/a 73 72
n/a 68 67
n/a 63 62
090 110
88 88
83 83
78 78
73 73
68 68
63 63
58 58
53 53
48 48
43 43