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Refer to latest edition of B149 Installation code.
A vent shall not terminate:
1. Directly above a paved sidewalk or driveway
which is located between two single-family dwell-
ings and serves both dwellings.
2. Less than 7 ft (2.13 m) above a paved sidewalk or
paved driveway located on public property.
3. Within 6 ft (1.8 m) of a mechanical air supply inlet
to any building.
4. Above a meter/regulator assembly within 3 ft (915
mm) horizontally of the vertical centre-line of the
regulator.
5. Within 6 ft (1.8 m) of any gas service regulator
vent outlet.
6. Less than 1 ft (305 mm) above grade level.
7. Within the 3 ft (915 mm) of a window or door which
can be opened in any building, any non-mechani-
cal air supply inlet to any building or the
combustion air inlet of any other appliance.
8. Underneath a verandah, porch or deck, unless the
verandah, porch or deck is fully open on a mini-
mum 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 1 ft (305 mm).
5. Terminate vent at least 6 ft away from adjacent
walls.
6. DO NOT terminate vent closer than 5 ft below roof
overhang.
7. The vent terminal requires a 12 in. vent terminal
clearance from the wall.
8. Terminate vent at least 1 ft above grade, including
normal snow line.
9. Multiple sidewall vent installations require a 4 ft
clearance between the ends of vent caps located
on the same horizontal plane.
Changing the Flue Outlet
Follow these instructions to change the flue connec-
tion from the standard top location to the rear of the
heater (with optional flue exhaust tee).
1. Disconnect all electrical power from the heater (if
applicable).
2. Disconnect or isolate the main gas pipe from the
heater (if applicable).
3. Remove the screws, gasket and dustcover from
the rear of the heater.
4. Remove the screws, stainless steel flue cover and
gasket from the branch side of the tee located in
the flue box at the rear of the heater.
5. Remove the screws, retaining ring and rain gasket
from top of heater.
6. Remove the screws, flue collar and gasket from
the run side of the tee located in the flue box on
top of the heater.
7. Reverse the components and reattach in the new
location.
8. Make sure that the stainless steel cover, now lo-
cated on the run side of the tee, is sealed to avoid
any flue gas spillage.
Venting Installation Tips
Support piping:
• horizontal runs - at least every 5 ft
• vertical runs - use braces
• under or near elbows
CAUTION: The silicone vent gaskets must be prop-
erly reinstalled to prevent flue gas leakage. Replace
any torn or worn vent gaskets.
WARNING: Examine the venting system at least
once a year. Check all joints and vent pipe
connections for tightness, corrosion or deterioration.
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