Lennox MERIT Series Installation Instructions Manual page 18

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 calcu-
lation.
1-1/2" Pipe
No. Of
90° Models
Elbows
045 070
1 10 10
2
3
4
5
6 n/a n/a
7
8
9
10
1-1/2" Pipe
No, Of
90° Model
Elbows
045 070
1 10 10
2
3
4
5
6 n/a n/a
7
8
9
10
TABLE 7 continued
Concentric Termination at Elevation 0 - 4500 ft
2" Pipe
Model
090 110 045 070
73 58
68 53
63 48
58 43
53 38
n/a n/a
48 33
43 28
38 23
33 18
28 13
Concentric Termination Elevation 4500 - 10,000 ft
2" Pipe
Model
090 110 045 070
73 58
68 53
63 48
58 43
53 38
n/a n/a
48 33
43 28
38 23
33 18
28 13
2-1/2" Pipe
Model
090 110 045 070
42 12 105 105
37 7 100 100
32 95 95
27 90 90
22 85 85
17 80 80
n/a
12 75 75
70 70
n/a 65 65
60 60
2-1/2" Pipe
Model
090 110 045 070
42 105 105
37 100 100
32 95 95
27 90 90
22 85 85
n/a
17 80 80
12 75 75
70 70
n/a 65 65
60 60
Page 18
3" Pipe
Model
090 110 045 070
89 44 121 121
84 39 116 116
79 34 111 111
74 29 106 106
69 24 101 101
64 19 96 96
59 14 91 91
54 9 86 86
49 81 81
n/a
44 76 76
3" Pipe
Model
090 110 045 070
89 44 121 121
84 39 116 116
79 34 111 111
74 29 106 106
69 24 101 101
64 19 96 96
59 14 91 91
54 9 86 86
49 81 81
n/a
44 76 76
090 110
114 104
109 99
104 94
99 89
94 84
89 79
84 74
79 69
74 64
69 59
090 110
114 104
109 99
104 94
99 89
94 84
89 79
84 74
79 69
74 64
69 59