TABLE 7
Vent Connector Capacity
Type B Double−Wall Vents with Single−Wall Metal Connectors
Serving Two or More Category I Appliances
|
|
|
|
| Vent and Connector Diameter − D (inches) |
|
|
| |||||
Height | Lateral |
|
|
|
|
|
|
|
|
|
|
|
|
| 3 Inch | 4 Inch |
|
| 5 Inch |
| 6 Inch | ||||||
H | L |
|
|
|
| ||||||||
|
|
|
|
|
|
|
|
|
|
|
| ||
|
|
| Appliance Input Rating in Thousands of Btu Per Hour |
|
|
| |||||||
(feet) | (feet) |
|
|
|
|
|
| ||||||
|
|
|
|
|
|
|
|
|
|
|
| ||
|
| MIN |
| MAX | MIN |
| MAX | MIN |
| MAX | MIN |
| MAX |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 1 | NR |
| NR | NR |
| NR | NR |
| NR | NR |
| NR |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
6 | 2 | NR |
| NR | NR |
| NR | NR |
| NR | 168 |
| 182 |
| 3 | NR |
| NR | NR |
| NR | 121 |
| 131 | 175 |
| 198 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 1 | NR |
| NR | NR |
| NR | NR |
| NA | NR |
| NR |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
8 | 2 | NR |
| NR | NR |
| NR | 125 |
| 126 | 184 |
| 193 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 3 | NR |
| NR | NR |
| NR | 130 |
| 138 | 191 |
| 208 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 1 | NR |
| NR | NR |
| NR | 119 |
| 121 | 182 |
| 186 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
10 | 2 | NR |
| NR | 84 |
| 85 | 124 |
| 134 | 189 |
| 203 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 3 | NR |
| NR | 89 |
| 91 | 129 |
| 144 | 197 |
| 217 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 1 | NR |
| NR | 79 |
| 87 | 116 |
| 138 | 177 |
| 214 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
15 | 2 | NR |
| NR | 83 |
| 94 | 121 |
| 150 | 185 |
| 230 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 3 | NR |
| NR | 87 |
| 100 | 127 |
| 160 | 193 |
| 243 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 1 | 49 |
| 56 | 78 |
| 97 | 115 |
| 152 | 175 |
| 238 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
20 | 2 | 52 |
| 59 | 82 |
| 103 | 120 |
| 163 | 182 |
| 252 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 3 | 55 |
| 62 | 87 |
| 107 | 125 |
| 172 | 190 |
| 264 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 1 | 47 |
| 60 | 77 |
| 110 | 112 |
| 175 | 169 |
| 278 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
30 | 2 | 51 |
| 62 | 81 |
| 115 | 117 |
| 185 | 177 |
| 290 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 3 | 54 |
| 64 | 85 |
| 119 | 122 |
| 193 | 185 |
| 300 |
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).
TABLE 8
Common Vent Capacity
Type B Double−Wall Vents with Single−Wall Metal Connectors
Serving Two or More Category I Appliances
Vent |
|
|
| Common Vent Diameter − D (inches) |
|
| |||
|
|
|
|
|
|
|
|
| |
Height | 4 Inch | 5 Inch | 6 Inch | 7 Inch | |||||
|
|
|
|
|
|
|
|
| |
H |
|
| 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 | NA | 78 | NA |
| 113 | 200 | 158 | 304 | 244 |
|
|
|
|
|
|
|
|
|
|
8 | NA | 87 | NA |
| 126 | 218 | 173 | 331 | 269 |
|
|
|
|
|
|
|
|
|
|
10 | NA | 94 | 163 |
| 137 | 237 | 189 | 357 | 292 |
|
|
|
|
|
|
|
|
|
|
15 | 121 | 108 | 189 |
| 159 | 275 | 221 | 416 | 343 |
|
|
|
|
|
|
|
|
|
|
20 | 131 | 118 | 208 |
| 177 | 305 | 247 | 463 | 383 |
|
|
|
|
|
|
|
|
|
|
30 | 145 | 132 | 236 |
| 202 | 350 | 286 | 533 | 446 |
Page 21
