16
venting
Avoiding Smoke and Odors
Negative Pressure, Shut-down, and Power
Failure:
T
o 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.
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.
Canadian Standard ulC S627 requires that all
outdoor-aired space heaters must be attached to
the structure. See page 12, Fig 16.
wArNINg! ChImNEY ANd CONNECTOr
muST bE mAINTAINEd IN gOOd
CONdITION ANd KEPT ClEAN.
dO NOT INSTAll A FluE dAmPEr IN ThE
EXhAuST vENTINg SYSTEm OF ThIS
APPlIANCE.
dO NOT CONNECT ThIS uNIT TO A
ChImNEY FluE SErvINg ANOThEr
APPlIANCE.
ChImNEY CONNECTOr mAY NOT PASS
ThrOugh AN ATTIC Or rOOF SPACE,
ClOSET Or SImIlAr CONCEAlEd SPACE,
Or A FlOOr Or CEIlINg.
