750-382
CBT
3-3
Vent terminal location
3. The bottom of the vent terminal and the air intake shall be located at least 24 inches above grade, including
normal snow line.
4. Un-insulated single-wall metal vent pipe shall not be used outside in cold climates for venting combustion
gas.
5. Through-the-wall vents for Category II and IV appliances and non-categorized condensing appliances shall
not terminate over public walkways or over an area where condensate or vapor could create a nuisance or
hazard or could be detrimental to the operation of other equipment. Where local experience indicates that
condensate is a problem with Category III appliances, this provision shall also apply.
6. Locate and guard vent termination to prevent accidental contact by people and pets.
7. DO NOT terminate vent in window well, alcove, stairwell or other recessed area, unless previously approved
by local authority.
8. DO NOT terminate above any door, window, or gravity air intake. Condensate can freeze causing ice
formations.
9. Locate or guard vent to prevent condensate from damaging exterior finishes. Use a 2' x 2' rust resistant sheet
metal backing plate against brick or masonry surfaces.
10. Minimize exposed flue venting outside of building in extreme cold climates. In winter conditions condensate
could freeze and block the flue pipe or termination.
11. Ensure combustion air intake(s) are a sufficient distant away from any exhaust terminations to avoid drawing
in flue gases or other contaminants.
U.S. installations- Refer to latest edition of the National Fuel Gas Code.
Vent termination requirements are as follows:
1. Vent must terminate at least four (4) feet below, four (4) feet horizontally, or one (1) foot above any door,
window or gravity air inlet to the building.
2. The vent must not be less than seven (7) feet above grade when located adjacent to public walkways.
3. Terminate vent at least three (3) feet above any forced air inlet located within ten (10) feet.
4. Vent must terminate at least four (4) feet horizontally, and in no case above or below unless four (4) feet
horizontal distance is maintained, from electric meters, gas meters, regulators, and relief equipment.
5. Terminate vent at least six (6) feet away from adjacent walls.
6. DO NOT terminate vent closer than five (5) feet below roof overhang.
Canada installations- Refer to the latest edition of CAN/CGA-B149.1 and B149.2
A vent shall not terminate:
1. Directly above a paved sidewalk or driveway which is located between two single family dwellings and serves
both dwellings.
2. Less than 7 ft. (2.13m) above a paved sidewalk or paved driveway located on public property.
3. Within 6 ft. (1.8m) of a mechanical air supply inlet to any building.
4. Above a meter/regulator assembly within 3 ft. (900mm) horizontally of the vertical center-line of the regulator.
5. Within 6 ft. (1.8m) if any gas service regulator vent outlet.
6. Less than 1 ft. (300mm) above grade level.
7. Within 3 ft. (1m) of a window or door which can be opened in any building, any non-mechanical air supply
inlet to any building to the combustion air inlet of any other appliance.
8. Underneath a verandah, porch or deck, unless:
A. The verandah, porch or deck is fully open on a minimum of two sides beneath the floor.
B. the distance between the top of the vent termination and the underside of the verandah, porch or deck is
greater than 1 ft. (30cm)
Note: For direct vent installations where the air is piped in from outside, a protective screen on the air inlet
termination elbow must be used to act as an inlet screen.
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