Reznor UBXC - Page 25

25
UBXC-UDXC-IOM (01-24) 1042980-0
• For Category III vents, refer to Table 11 for horizontal vent terminal clearances.
Figure 9. Roof Slope and Pitch
Table 10. Vent Termination Height
Roof Slope
Flat to
6/12
Over
6/12–7/12
Over
7/12–8/12
Over
8/12–9/12
Over
9/12–10/12
Over
10/12–11/12
Over
11/12–12/12
Over
12/12–14/12
Over
14/12–16/12
Over
16/12–18/12
Over
18/12–20/12
Over
20/12–21/12
Dimension H (Feet (Meters))*
1.0 (0.30) 1.25 (0.38) 1.5 (0.46) 2.0 (0.61) 2.5 (0.76) 3.25 (0.99) 4.0 (1.22) 5.0 (1.52) 6.0 (1.83) 7.0 (2.13) 7.5 (2.27) 8.0 (2.44)
*See Figure 9. Termination locations for gas vents with listed caps 12 inches (300 mm) or less in size at least 8 inches (2.4 meters) from a
vertical wall.
Table 11. Minimum Clearance Requirements for Category III Horizontal Vent Terminal
Component/Structure Minimum Clearance, All Directions Unless Specified (Feet (Meters))
Forced air inlet within 10 feet (3.1 meters)*
3 (0.9) above
Combustion air inlet of another appliance 6 (1.8)
Mechanical air supply inlet to any building Canada: 6 (1.8)
Any building opening (door, window, or gravity air inlet)
4 (1.2) horizontal and below
1 (0.3) above
Gas meter,** electric meter, and relief equipment
US: 4 (1.2) horizontal
Canada: 6 (1.8) horizontal
Gas regulator**
US: 3 (0.9) horizontal
Canada: 6 (1.8) horizontal
Adjoining building or parapet 6 (1.8)
Adjacent public walkway 7 (2.1) above
Grade (ground level) 3 (0.9) above
*Does not apply to the inlet of a direct vent appliance.
**Do not terminate the vent directly above a gas meter or service regulator.