Lennox SL280DFV Installation Instructions Manual page 18

Height Lateral
H L
(feet) (feet)
1
2
6
3
1
2
8
3
1
2
10
3
1
2
15
3
1
2
20
3
1
2
30
3
NOTE − Single appliance venting configurations with zero lateral lengths are assumed to have no elbows in the vent system. For all other
vent configurations, the vent system is assumed to have two 90° elbows. For each additional 90° elbow or equivalent (for example two 45°
elbows equal one 90° elbow) beyond two, the maximum capacity listed in the venting table should be reduced by 10 percent (0.90 x maxi-
mum listed capacity).
Vent
4 Inch
Height
H
(feet)
FAN + FAN
6 NA
8 NA
10 NA
15 121
20 131
30 145
Vent Connector Capacity
Type B Double−Wall Vents with Single−Wall Metal Connectors
Serving Two or More Category I Appliances
3 Inch
Appliance Input Rating in Thousands of Btu Per Hour
MIN MAX MIN
NR NR
NR NR
NR NR
NR NR
NR NR
NR NR
NR NR
NR NR
NR NR
NR NR
NR NR
NR NR
49 56
52 59
55 62
47 60
51 62
54 64
Common Vent Capacity
Type B Double−Wall Vents with Single−Wall Metal Connectors
Serving Two or More Category I Appliances
Common Vent Diameter − D (inches)
5 Inch
Appliance Input Rating in Thousands of Btu Per Hour
FAN + NAT FAN + FAN
78 NA
87 NA
94 163
108 189
118 208
132 236
TABLE 9
Vent and Connector Diameter − D (inches)
4 Inch
MAX MIN
NR NR NR
NR NR NR
NR NR 121
NR NR NR
NR NR 125
NR NR 130
NR NR 119
84 85 124
89 91 129
79 87 116
83 94 121
87 100 127
78 97 115
82 103 120
87 107 125
77 110 112
81 115 117
85 119 122
TABLE 10
6 Inch
FAN + NAT FAN + FAN
113 200
126 218
137 237
159 275
177 305
202 350
Page 18
5 Inch 6 Inch
MAX MIN
NR NR
NR 168
131 175
NA NR
126 184
138 191
121 182
134 189
144 197
138 177
150 185
160 193
152 175
163 182
172 190
175 169
185 177
193 185
7 Inch
FAN + NAT FAN + FAN
158 304
173 331
189 357
221 416
247 463
286 533
MAX
NR
182
198
NR
193
208
186
203
217
214
230
243
238
252
264
278
290
300
FAN + NAT
244
269
292
343
383
446