Venting Instructions

4
CP-UBX-UDX-VENT (03-21) 1034631-0
GENERAL INFORMATION—CONTINUED
Vent Terminal (Type of Pipe and Vent Cap) Requirements—Continued
Table 2. Minimum Clearance Requirements for 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.
• Vertical vents must terminate a minimum horizontal and vertical distance from roof lines and adjacent walls or
obstructions. These minimum distances are outlined as follows (based on National Fuel Gas Code requirements
for vents with diameters less than 12”):
• For double-wall vent pipe and a horizontal distance to any vertical wall or similar obstruction of 8 feet or greater,
the vent must terminate above the roof in accordance with Figure 1 and Table 3.
• For double wall vent pipe and a horizontal distance to any vertical wall or similar obstruction of less than 8 feet,
the vent must terminate at least 2 feet above the highest point where it passes through a roof of a building and at
least 2 feet higher than any portion of a building within a horizontal distance of 10 feet (refer to Table 3).
Figure 1. Roof Slope and Pitch
Table 3. 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 1. Termination locations for gas vents with listed caps 12ʺ (300 mm) or less in size at least 8ʺ (2.4 meters) from a vertical wall.