Lennox EL296UHVX Series Unit Information page 57

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.
1-1/2" Pipe
Number
Of 90°
Model
Elbows
Used
045 070
1 20 15
2 15 10
3 10
4
5
6
n/a
7
n/a
8
9
10
1-1/2" Pipe
Number
Of 90°
Model
Elbows
Used
045 070
1 20 15
2 15 10
3 10
4
5
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
090 110 135 045 070 090 110 135 045 070 090 110 135 045 070 090 110 135
71 56
66 51
61 46
56 41
51 36
n/a n/a n/a
46 31
41 26
36 21
31 16
26 11
Standard Termination Elevation 4500 - 10,000 ft
090 110 135 045 070 090 110 135 045 070 090 110 135 045 070 090 110 135
71 56
66 51
61 46
56 41
51 36
n/a n/a n/a
46 31
41 26
36 21
31 16
26 11
TABLE 25
2" Pipe 2-1/2" Pipe
Model
34 14 100 100
29 9 95 95
24 4 90 90
19 85 85
14 80 80
n/a
9 85 75
4 70 70
n/a
65 65
n/a 60 60
55 55
2" Pipe 2-1/2" Pipe
Model
34 100 100
29 95 95
24 90 90
19 85 85
14 80 80
n/a n/a
9 85 85
4 70 70
65 65
60 60
n/a
55 55
Page 57
3" Pipe
Model Model
78 43 118 117
73 38 113 112
68 33 108 107
63 28 103 102
58 23 98 97
n/a
63 18 93 92
48 13 88 87
43 8 83 82
38 3 78 77
33 n/a 73 72
3" Pipe
Model Model
78 43 118 117
73 38 113 112
68 33 108 107
63 28 103 102
58 23 98 97
n/a
53 18 93 92
48 13 88 87
43 8 83 82
38 3 78 77
33 n/a 73 72
98 98 94
93 93 89
88 88 84
83 83 79
78 78 74
73 73 69
68 68 64
63 63 59
58 58 54
53 53 49
98 98 94
93 93 89
88 88 84
83 83 79
78 78 74
73 73 69
68 68 64
63 63 59
58 58 54
53 53 49