Ace Heating Solutions Atlas A050 Operating And Maintenance Manual page 19

US Installations
Refer to the latest edition of the National Fuel Gas Code.
1. Vent must terminate at least 4ft below, 4 ft horizontally from or 1 ft above any door, window or gravity air inlet to
the building.
2. The vent must not be less than 7ft above grade when located adjacent to public walkways.
3. Terminate vent at least 3ft above forced air inlet located within 10ft.
4. Vent must terminate at least 4ft horizontally, and in no case above or below unless 4ft horizontal distance is
maintained, from electric meters, gas meters, regulators, and relief equipment.
5. Terminate vent at least 6ft away from adjacent walls.
6. Do not terminate vent closer to 5ft below roof overhang.
7. Terminate vent at least 1ft above grade, including snow line.
8. Multiple direct vents installations require a 4ft clearance between the ends of vent caps located on the same
horizontal plane.
Canadian Installations
Refer to the latest edition of CGA, B149 Installation Code.
1. A vent shall not terminate directly above a paved sidewalk or driveway which is located between two single –
family dwelling and serves both dwellings.
2. A vent shall not terminate less than 7ft above a paved sidewalk or paved driveway located on public property.
3. A vent shall not terminate within 6ft of a mechanical air supply inlet to any building.
4. A vent shall not terminate above a meter/regulator assembly within 3ft horizontally of the vertical centre – line of
the regulator.
5. A vent shall not terminate within 6ft of any gas service regulator.
6. A vent shall not terminate less than 1ft above grade level.
7. A vent shall not terminate within 3ft of a window or door which can be opened in any building, any non –
mechanical air supply inlet of any other appliance.
8. A vent shall not terminate underneath a verandah, porch or deck, unless the verandah, 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 verandah, porch or deck is greater than 1ft.
Venting Tips:
Support piping: For horizontal runs, add supports at least every 5ft.; For vertical runs, use braces under or near elbows.
Warning: Examine the venting system at least once a year. Check all joints and vent pipe connections for
tightness, corrosion or deterioration.
Venting Configurations
For boilers connected to gas vents or chimneys, vent installations shall be in accordance with the NFGC (US) or CGA,
B149 (Canada), or applicable provisions of local building codes.
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