NOTICE
If 4 inch PVC or CPVC pipe is used, then a 4 inch PVC or CPVC screened intake and exhaust 90° elbow is required.
Direct Vent Terminal Location
Plan the vent system layout so that proper clearances are maintained from plumbing and wiring. Before the vent is installed, determine the vent pipe termination location as shown below in Figure 10.
EXCEPTIONS FOR INSTALLATIONS
The vent terminal must not terminate:
1.Directly above a paved sidewalk or paved driveway which is located between two
2.Less than 7 feet (2.1 m) above a paved sidewalk or a paved driveway located on public property;
3.Within 6 feet (1.8 m) of a mechanical air supply inlet to any building;
Figure 10 | Vent Terminal Location |
Vent terminals must terminate at least 3 feet (0.9 m) above any forced air inlet located within 10 feet (3.1 m). This provision does not apply to:
1.The combustion air intake of a direct vent appliance or the circulating air inlet and flue gas discharge of listed outdoor appliances.
2.The exhaust vent terminal must be installed with at least 12 inches (30 cm) clearance from any air opening into a building.
3.The bottom of the exhaust vent and combustion air intake terminals must be located at least 12 inches (30 cm) above grade and above the anticipated snow level.
4.Must be installed at least 3 feet (0.9 m) from any gas meter, gas valve or other gas regulating equipment.Must be installed in a location where it will not be blocked by snow.
5.The exhaust vent and combustion air intake terminals must be installed so that the centerline distances are at least 18 inches (45.7cm) apart and the exhaust vent terminal elbow extends 6 inches (15.2 cm) past the combustion air intake terminal.
4.Above a gas meter/regulator assembly within 3 feet (0.9 m) horizontally of the vertical centerline of the regulator;
5.Within 6 feet (1.8m) of any gas service regulator vent outlet;
6.Less than 1 foot (30.5 cm) above grade level;
7.Within 12 inches (30.5 cm) of a window or door, which can be opened in any building, any
8.Underneath a veranda, porch or deck, unless:
•The veranda, porch or deck is fully open on a minimum of two sides beneath the floor and
•The distance between the top of the vent termination and the underside of the veranda, porch or deck is greater than 1 foot (30.5 cm).
The vent system must terminate so that proper clearances are maintained as cited in local codes or the latest edition of the National Fuel Gas Code, ANSI Z223.1.73.4e and 7.8a, b as follows:
1.Do not terminate the exhaust vent terminal over public area where condensate or vapor can cause nuisance or hazard.
2.For direct vent, the venting system shall terminate at least 1 foot below, 1 foot horizontally from or 1 foot above any door, window, or gravity air inlet into building.
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