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UBXC-UDXC-IOM (01-24) 1042980-0
Figure 15. Typical Category I Common Vertical Vent
H = COMMON VENT HEIGHT = VERTICAL DISTANCE FROM HIGHEST DRAFT HOOD OUTLET OR FLUE COLLAR TO VENT CAP
OR CHIMNEY OUTLET OF COMMON VENT
R = VENT CONNECTOR RISE = VERTICAL DISTANCE FROM EACH HEATER OR APPLIANCE OUTLET TO CENTER LINE WHERE
VENT GAS STREAMS COME TOGETHER (3 FEET (0.9 METER) MAXIMUM)
VENT CONNECTOR = HORIZONTAL LENGTH OF VENT PIPE BETWEEN EACH APPLIANCE AND VERTICAL COMMON VENT
UNIT
UNIT
Table 15. Category I Common Vertical Vent Capacity
Appliance Types
Sharing Common
Vertical Vent
Vent
Diameter
(Inches (mm))*
Vent Height (Feet (Meters))
6 (1.8) 7 (2.1) 8 (2.4) 10 (3.0) 15 (4.6) 20 (6.1) 30 (9.1)
Maximum Combined Input Rating of Appliances (MBTUh)
Two fan-assisted
appliances
5 (127)
— 147 170 187 212 241
6 (152)
180 188 196 213 248 275 315
7 (178)
274 286 298 321 374 417 480
One fan-assisted
appliance and one
non-fan-assisted
appliance**
5 (127)
102 108 113 123 143 159 182
6 (152)
142 149 156 170 199 222 257
7 (178)
220 231 242 263 309 345 401
*Type B double-wall vent pipe.
**Non-fan-assisted appliances rely solely on the natural buoyancy of the vent gases for venting.