Venting; Avoiding Smoke And Odors - Harman Advance Pellet Stove Installation & Operating Manual

Avoiding Smoke and Odors

Negative Pressure, Shut-down, and Power
Failure:
To reduce the probability of back-drafting or burn-
back in the pellet burning appliance during power
failure or shut-down conditions, the stove must
be able to draft naturally without exhaust blower
operation. Negative pressure in the house will resist this
natural draft if not accounted for in the pellet appliance
installation.
Heat rises in the house and leaks out at upper levels.
This air must be replaced with cold air from outdoors,
which flows into lower levels of the house. Vents and
chimneys into basements and lower levels of the house
can become the conduit for air supply, and reverse
under these conditions.
Outside Air:
harman home heating and hearth & home
Technologies recommend attaching outside air in
all installations, especially lower level and main
floor locations.
Per national building codes, consideration must
be given to combustion air supply to all combustion
appliances. Failure to supply adequate combustion air
for all appliance demands, may lead to back-drafting
of those and other appliances.
When the appliance is side-wall vented: The air intake
is best located on the same exterior wall as the exhaust
vent outlet and located lower on the wall than the
exhaust vent outlet.
When the appliance is roof vented: The air intake is
best located on the exterior wall oriented towards the
prevailing wind direction during the heating season.
The outside air connection will supply the demands of
the pellet appliance, but consideration must be given to
the total house demand. House demand may consume
some air needed for the stove, especially during a power
failure. It may be necessary to add additional ventilation
to the space in which the pellet appliance is located.
Consult with your local HVAC professional to determine
the ventilation demands for your house.
NOTICE: In Canada, ULC-S627 requires that all
outdoor-aired space heaters be secured to the structure.

venting

vent Configurations:
To reduce probability of reverse drafting during shut-
down conditions, Hearth & Home Technologies strongly
recommends:
• Installing the pellet vent with a minimum vertical run
of five feet, preferably terminating above the roof line.
• Installing the outside air intake at least four feet below
the vent termination.
To prevent soot damage to exterior walls of the house
and to prevent re-entry of soot or ash into the house:
• Maintain specified clearances to windows, doors, and
air inlets, including air conditioners.
• Vents should not be placed below ventilated soffits.
Run the vent above the roof.
• Avoid venting into alcove locations.
• Vents should not terminate under overhangs, decks
or onto covered porches.
• Maintain minimum clearance of 12 inches from the
vent termination to the exterior wall. If you see deposits
developing on the wall, you may need to extend this
distance to accommodate your installation conditions.
hearth & home Technologies assumes no
responsibility for, nor does the warranty extend
to, smoke damage caused by reverse drafting of
pellet appliances under shut-down or power failure
conditions.
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