Lennox EL296UHE Series Unit Information page 29

Maximum Allowable Exhaust Vent Lengths With Furnace Installed in a Closet or Basement Using Ventilated
NOTE - Size intake and exhaust pipe length separately. Values in table are for Intake OR Exhaust, not combined total.
Both Intake and Exhaust must be same pipe size.
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 1-1/2" Pipe
Of 90°
Model
Elbows
045 070 090
Used
1 20 15
2 15 10
3 10
4
5
n/a
6
n/a
7 n/a
8
9
10
Number 1-1/2" Pipe
Of 90°
Model
Elbows
045 070 090 110 135 045 070 090 110 135 045 070 090 110 135 045 070 090 110 135
Usedl
1 20 15
2 15 10
3 10
4
5
n/a
6
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
110 135 045 070 090 110 135 045
71 56 34
66 51 29
61 46 24
56 41 19
51 36 14
n/a n/a
46 31 9
41 26 4
36 21
31 16 n/a
26 11
Standard Termination Elevation 4500 - 10,000 ft
2" Pipe
Model
71 56 34
66 51 29
61 46 24
56 41 19
51 36 14
n/a n/a
46 31 9
41 26 4
36 21
31 16 n/a
26 11
TABLE 18
2-1/2" Pipe
Model
070 090 110 135
14 100 100 78
9 95 95 73
4 90 90 68
85 85 63
80 80 58
n/a
75 75 53
n/a 70 70 48
65 65 43
60 60 38
55 55 33
2-1/2" Pipe
Model
100 100 78
95 95 73
90 90 68
85 85 63
80 80 58
n/a n/a
75 75 53
70 70 48
65 65 43
60 60 38
55 55 33
Page 29
3" Pipe
Model
045 070 090 110 135
43 118 117 98
38 113 112 93
33 108 107 88
28 103 102 83
23 98 97 78
n/a
18 93 92 73
13 88 87 68
8 83 82 63
3 78 77 58
n/a 73 72 53
3" Pipe
Model
43 118 117 98
38 113 112 93
33 108 107 88
28 103 102 83
23 98 97 78
n/a
18 93 92 73
13 88 87 68
8 83 82 63
3 78 77 58
n/a 73 72 53
98 94
93 89
88 84
83 79
78 74
73 69
68 64
63 59
58 54
53 49
98 94
93 89
88 84
83 79
78 74
73 69
68 64
63 59
58 54
53 49