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TABLE 5
CAPACITY OF TYPE B DOUBLE-WALL VENTS WITH TYPE B DOUBLE-WALL CONNECTORS
SERVING TWO OR MORE CATEGORY I APPLIANCES
VENT CONNECTOR CAPACITY
Vent
Connector
Vent and Connector Diameter − D (inches)
V
ent
Hei
g
ht
C
onnector
Rise
4 Inch 5 Inch 6 Inch 7 Inch
Height
H
(feet)
Rise
R
(feet)
Appliance Input Rating in Thousands of Btu Per Hour
(feet) (feet)
MIN MAX MIN MAX MIN MAX MIN MAX
1 35 66 46 106 58 164 77 225
6
2 37 75 48 121 60 183 79 253
6
3 38 81 49 132 62 199 82 275
1 35 72 49 114 64 176 84 243
8
2 36 80 51 128 66 195 86 269
3 37 87 53 139 67 210 88 290
1 34 78 49 123 65 189 89 257
10
2 36 86 51 136 67 206 91 282
3 37 92 52 146 69 220 94 303
1 33 89 47 142 64 220 88 298
15
2 35 96 49 153 66 235 91 320
3 36 102 51 163 68 248 93 339
1 33 99 46 157 62 246 86 334
20
2 34 105 48 167 64 259 89 354
3 35 110 50 176 66 271 91 371
1 31 113 45 181 60 288 83 391
30
2 33 118 47 190 62 299 85 408
3 34 123 48 198 64 309 88 423
TABLE 6
CAPACITY OF TYPE B DOUBLE-WALL VENTS WITH TYPE B DOUBLE-WALL CONNECTORS
SERVING TWO OR MORE CATEGORY I APPLIANCES
COMMON VENT CAPACITY
Vent
Common Vent Diameter − D (inches)
V
ent
Hei
g
ht
4 Inch 5 Inch 6 Inch 7 Inch
Height
H
(feet)
Appliance Input Rating in Thousands of Btu Per Hour
(feet)
FAN + FAN FAN + NAT FAN + FAN FAN + NAT FAN + FAN FAN + NAT FAN + FAN FAN + NAT
6 92 81 140 116 204 161 309 248
8 101 90 155 129 224 178 339 275
10 110 97 169 141 243 194 367 299
15 125 112 195 164 283 228 427 352
20 136 123 215 183 314 255 475 394
30 152 138 244 210 361 297 547 459