Vent
Height
H
(feet)
6
8
10
t5
20
30
TABLE 6
VENT CONNECTOR CAPACITY
TYPE B DOUBLE-WALL VENTS WITH TYPE B DOUBLE-WALL CONNECTORS
Connector
Rise
R
(feet)
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
SERVING TWO OR MORE CATEGORY I APPLIANCES
MIN
22
23
24
22
23
24
22
23
24
2t
22
24
21
22
23
20
21
22
3 inch
MAX
37
41
44
40
44
47
43
47
50
50
53
55
54
57
6O
62
64
66
Vent and Connector Diameter - D (inches)
4 inch I 5 Inch
B
Appliance Input Rating in Thousands of Btu Per Hour
MIN
35
37
38
35
36
37
34
36
37
33
35
36
33
34
35
31
33
34
MAX MIN MAX
66 46 106
75 48 121
81 49 132
72 49 114
80 51 128
87 53 139
78 49 123
86 51 136
92 52 146
89 47 142
96 49 153
102 51 163
g9 46 157
105 48 167
110 50 176
113 45 181
118 47 190
123 48 198
MIN
58
60
62
64
66
67
65
67
69
64
66
68
62
64
66
6O
62
64
6inch
MAX
164
183
199
176
195
210
189
206
220
220
235
248
246
259
271
288
299
309
Vent
Height
H
(feet)
6
8
10
15
20
3O
TABLE 7
COMMON VENT CAPACITY
TYPE B DOUBLE-WALL VENTS WITH TYPE B DOUBLE-WALL CONNECTORS
SERVING TWO OR MORE CATEGORY I APPLIANCES
4 Inch
FAN+ FAN FAN+NAT
92 81
101 90
110 97
125 112
136 123
t52 138
Common Vent Diameter - D (Inches)
5 Inch 6 Inch 7 Inch
Appliance Input Rating in Thousands of Btu Per Hour
FAN + NAT
116
129
141
164
183
210
FAN + FAN
204
224
243
283
314
361
FAN + NAT
161
178
194
228
255
297
FAN ÷ FAN
3O9
339
367
427
475
547
FAN + FAN
140
155
169
195
215
244
FAN+NAT
248
275
299
352
394
459
Page 17
To Next Page
Loading...
