Lennox SLP98DF090XV48C

Page 40
TABLE 24
Maximum Allowable Intake or Exhaust Vent Length in Feet
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.
Standard Termination at Elevation 0 - 4500'
Number Of
90° Elbows
Used
2” Pipe 2-1/2” Pipe 3” Pipe
Model Model Model
070 090 110 070 090 110 070 090 110
1 91 69 14 140 93 43 162 143 118
2 86 64 9 135 88 38 157 138 113
3 81 59
n/a
130 83 33 152 133 108
4 76 54 125 78 28 147 128 103
5 71 49 120 73 23 142 123 98
6 66 44 115 68 18 137 118 93
7 61 39 110 63 13 132 113 88
8 56 34 105 58
n/a
127 108 83
9 51 29 100 53 122 103 78
10 46 24 95 48 117 98 73
Standard Termination Elevation 4501' - 7500'
Number Of
90° Elbows
Used
2” Pipe 2-1/2” Pipe 3” Pipe
Model Model Model
070 090 110 070 090 110 070 090 110
1 66 69 14 115 93 43 137 143 118
2 61 64 9 110 88 38 132 138 113
3 56 59
n/a
105 83 33 127 133 108
4 51 54 100 78 28 122 128 103
5 46 49 95 73 23 117 123 98
6 41 44 90 68 18 112 118 93
7 36 39 85 63 13 107 113 88
8 31 34 80 58
n/a
102 108 83
9 26 29 75 53 97 103 78
10 21 24 70 48 92 98 73
Standard Terminating at Elevation 7501' - 10,000''
Number Of
90° Elbows
Used
2” Pipe 2-1/2” Pipe 3” Pipe
Model Model Model
070 090 110 070 090 110 070 090 110
1 41 44
n/a
90 68
n/a
112 118 93
2 36 39 85 63 107 113 88
3 31 34 80 58 102 108 83
4 26 29 75 53 97 103 78
5 21 24 70 48 92 98 73
6 16 19 65 43 87 93 68
7 11 14 60 38 82 88 63
8
n/a
n/a
55 33 77 83 58
9 50 28 72 78 53
10 45 23 67 73 48
NOTE - Table 23 continued on next page with concentric terminations.