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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:
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.
13
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.
NOTE: Simpson duravent Pelletvent Pro harman®
Adapter Part #3PvP-Adhb and Pelletvent Pro harman®
Adapter Increaser Part #3PvP-x4Adhb are highly
recommended to be installed on the starter collar to
insure a proper pipe connection to the unit.
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.
1-90-09730R29_02/14
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