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Type B Double Wall Vents with Type B Double Wall Connectors Serving Two or More Category I Appliances
Vent
Connector
Height
Rise
H
R
(feet)
(feet)
1
6
2
3
1
8
2
3
1
10
2
3
1
15
2
3
1
20
2
3
1
30
2
3
Type B Double Wall Vents with Type B Double Wall Connectors Serving Two or More Category I Appliances
Vent Height
H
(feet)
FAN + FAN FAN + NAT FAN + FAN FAN + NAT FAN + FAN FAN + NAT FAN + FAN FAN + NAT
6
8
10
15
20
30
507332-02G / 31-5000663
Vent Connector Capacity
3 inch
Appliance Input Rating in Thousands of Btu per Hour
MIN
MAX
22
37
23
41
24
44
22
40
23
44
24
47
22
43
23
47
24
50
21
50
22
53
24
55
21
54
22
57
23
60
20
62
21
64
22
66
Common Vent Capacity
4 inch
Appliance Input Rating in Thousands of Btu per Hour
92
81
101
90
110
97
125
112
136
123
152
138
Vent and Connector Diameter - D (inches)
4 inch
MIN
MAX
35
66
37
75
38
81
35
72
36
80
37
67
34
78
36
86
37
92
33
89
35
96
36
102
33
99
34
105
35
110
31
113
33
118
34
123
Table 6.
Common Vent Diameter - D (inches)
5 inch
140
116
155
129
169
141
195
164
215
183
244
210
Table 7.
Issue 2209
5 inch
MIN
MAX
46
106
48
121
49
132
49
114
51
128
53
139
49
123
51
136
52
146
47
142
49
153
51
163
46
157
48
167
50
176
45
181
47
190
48
198
6 inch
204
161
224
178
243
194
283
228
314
255
361
297
6 inch
MIN
MAX
58
164
60
183
62
199
64
176
66
195
67
210
65
189
67
206
69
220
64
220
66
235
68
248
62
246
64
259
66
271
60
288
62
299
64
309
7 inch
309
248
339
275
367
299
427
352
475
394
547
459
Page 17 of 35
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