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over an area where condensate or vapor could
create a nuisance or hazard or could be detrimen-
tal to the operation of regulators, relief valves, or
other equipment. Where local experience indi-
cates that condensate is a problem with Category
I and III appliances, this provision shall also apply.
f) Locate and guard vent termination to prevent acci-
dental contact by people or pets.
g) DO NOT terminate vent in window well, stairwell,
alcove, courtyard or other recessed area, unless
previously approved by local authority.
h) DO NOT terminate above any door, window, or
gravity air intake. Condensate can freeze, causing
ice formations.
i) 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.
j) DO NOT extend exposed vent pipe outside of
building. Condensate could freeze and block vent
pipe.
US Installations
Refer to latest edition of NFGC.
Vent termination requirements are as follows:
a) 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.
b) The vent must not be less than seven (7) feet
above grade when located adjacent to public walk-
ways.
c) Terminate vent at least three (3) feet above any
forced air inlet located within ten (10) feet.
d) Vent must terminate at least four (4) feet horizon-
tally, and in no case above or below unless four (4)
feet horizontal distance is maintained, from elec-
tric meters, gas meters, regulators, and relief
equipment.
e) Terminate vent at least six (6) feet away from adja-
cent walls.
f) DO NOT terminate vent closer than five (5) feet
below roof overhang.
g) The vent terminal of a direct vent appliance with
an input over 50,000 Btu per hour shall require a
12-inch vent terminal clearance.
h) Terminate vent at least one (1) foot above grade,
including normal snow line.
i) Multiple direct vent installations require a four (4)
foot clearance between vent caps.
Canada Installations
Refer to latest edition of CAN/CGA-B149.
A vent shall not terminate:
a) Directly above a paved sidewalk or driveway
which is located between two single family
dwellings and serves both dwellings
b) Less than 7 ft.(2.13m)above a paved sidewalk or
paved driveway located on public property
c) Within 6 ft(1.8m) of a mechanical air supply inlet to
any building
d) Above a meter/regulator assembly within 3
ft(900mm) horizontally of the vertical centre-line of
the regulator
e) Within 6 ft.(1.8m) of any gas service regulator vent
outlet
f) Less than 1 ft.(300mm) above grade level
g) Within the 3 ft.(1m) of a window or door which can
be opened in any building, any non-mechanical air
supply inlet to any building or the combustion air
inlet of any other appliance
h) Underneath a verandah, porch or deck, unless
(i) the verandah, porch or deck is fully open on a
minimum of two sides beneath the floor, and
(ii) the distance between the top of the vent termi-
nation and the underside of the verandah,
porch or deck is greater than 1 ft (30 cm).