|
|
|
| TABLE 7 |
|
|
|
| |
|
|
| Vent | Connector | Capacity |
|
|
| |
|
| Type B |
|
| |||||
|
| Serving Two or More Category I Appliances |
|
| |||||
Vent | Connector |
|
| Vent and Connector Diameter - D (inches) |
|
| |||
|
|
|
|
|
|
|
| ||
Height | Rise | 3 Inch |
| 4 Inch |
|
| 5 Inch |
| 6 Inch |
H | R |
| Appliance Input | Rating | in Thousands | of Btu Per Hour |
|
| |
(feet) | (feet) | MIN | MAX | MIN | MAX | MIN | MAX | MIN | MAX |
| I | 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 | 174 | 198 |
| 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 | 47 | 60 | 77 | 110 | 113 | 175 | 169 | 278 |
30 | 2 | 50 | 62 | 81 | 115 | 117 | 185 | 177 | 290 |
| 3 | 54 | 64 | 85 | 119 | 122 | 193 | 185 | 300 |
|
|
|
| TABLE 8 |
|
|
|
| |
|
|
| Common Vent Capacity |
|
|
| |||
|
| Type B |
|
| |||||
|
| 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 | 89 | 78 | 136 | 113 |
| 200 | 158 | 304 | 244 |
8 | 98 | 87 | 151 | 126 |
| 218 | 173 | 331 | 269 |
10 | 106 | 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 |
Removal of the Furnace from Common Vent
In the event that an existing furnace is removed from a venting system commonly run with separate gas ap- pliances, the venting system is likely to be too large to properly vent the remaining attached appliances,
Conduct the following test while each appliance is operat- ing and the other appliances (which are not operating) re- main connected to the common venting system. If the venting system has been installed improperly, you must correct the system as indicated in the general venting re- quirements section,
1 - Seal any unused openings in the common venting sys- tem.
_ Inspect the venting system for proper size and horizontal pitch, Determine that there is no blockage, restriction,
leakage, corrosion, or other deficiencies which could cause an unsafe condition,
3 - Close all building doors and windows and all doors be- tween the space in which the appliances remaining connected to the common venting system are located
and other spaces of the building. Turn on clothes dry- ers and any appliances not connected to the common venting system. Turn on any exhaust fans, such as range hoods and bathroom exhausts, so they will oper- ate at maximum speed. Do not operate a summer ex- haust fan. Close fireplace dampers,
4 - Follow the lighting instructions, Turn on the appliance that is being inspected. Adjust the thermostat so that the appliance operates continuously,
5 - After the main burner has operated for 5 minutes, test for leaks of flue gases at the draft hood relief opening, Use the flame of a match or candle, or smoke from a cigarette, cigar, or pipe,
6 - After determining that each appliance connected to the common venting system is venting properly, (step 3) return all doors, widows, exhaust fans, fireplace damp- ers, and any other
7 - If a venting problem is found during any of the preced- ing tests, the common venting system must be modi- fied to correct the problem,
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