Lennox SL280DFV Installation Instructions Manual page 17

Type B Double−Wall Vents with Type B Double−Wall Connectors
Vent Connector
Height Rise
H R
(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
Type B Double−Wall Vents with Type B Double−Wall Connectors
Vent
4 Inch
Height
H
(feet)
FAN + FAN
6 92
8 101
10 110
15 125
20 136
30 152
Vent Connector Capacity
Serving Two or More Category I Appliances
3 Inch
Appliance Input Rating in Thousands of Btu Per Hour
MIN MAX MIN
22 37 35
23 41 37
24 44 38
22 40 35
23 44 36
24 47 37
22 43 34
23 47 36
24 50 37
21 50 33
22 53 35
24 55 36
21 54 33
22 57 34
23 60 35
20 62 31
21 64 33
22 66 34
Common Vent Capacity
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
81 140
90 155
97 169
112 195
123 215
138 244
TABLE 7
Vent and Connector Diameter − D (inches)
4 Inch
MAX MIN
66 46
75 48
81 49
72 49
80 51
87 53
78 49
86 51
92 52
89 47
96 49
102 51
99 46
105 48
110 50
113 45
118 47
123 48
TABLE 8
6 Inch
FAN + NAT FAN + FAN
116 204
129 224
141 243
164 283
183 314
210 361
Page 17
5 Inch 6 Inch
MAX MIN
106 58
121 60
132 62
114 64
128 66
139 67
123 65
136 67
146 69
142 64
153 66
163 68
157 62
167 64
176 66
181 60
190 62
198 64
7 Inch
FAN + NAT FAN + FAN
161 309
178 339
194 367
228 427
255 475
297 547
MAX
164
183
199
176
195
210
189
206
220
220
235
248
246
259
271
288
299
309
FAN + NAT
248
275
299
352
394
459