T
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 ows 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.
Per national building codes, consideration must be
given to combustion air supply to all combustion ap-
pliances. 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, es-
pecially 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 lo-
cal HVAC professional to determine the ventilation
demands for your house.
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 ve 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 specied clearances to windows,
doors, and air inlets, including air conditioners.
• Vents should not be placed below ventilated
softs. 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.
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