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C. Venting & Use of Elbows
-
O
+
= Positive static pressure
O
-
= Negative static pressure
Figure 4.11
A combustion blower is used to extract the combustion
gases from the firebox. This causes a negative pressure in
the firebox and a positive pressure in the venting system as
shown in Figure 4.11. The longer the vent pipe and more
elbows used in the system, the greater the flow resistance.
The recommended maximum flue lengths for the XXV
Pellet Stove are as follows:
4" Stainless Steel Flex: 30 Lineal ft. Vertical*
4" PL Vent Pipe:
4" Pl Vent Pipe: 30 Lineal ft. Vertical*
4" Pl Vent Pipe: 14 ft. Vertical w/1-90
If additional 4" PL Vent fittings are required, the overall
length must be reduced by:
Vertical 90
or T:
2.5'
o
Vertical 45
:
1.5'
o
Horizontal 90
or T:
5.0'
o
Horizontal 45
:
2.5'
o
3" PL Vent Pipe:
20 Lineal ft. vertical*
8 Lineal ft. vertical w/1-90
& 4 lineal ft. horizontal*
o
If additional 3" PL Vent fittings are required, the overall
length must be reduced by:
Vertical 90
or T:
2.0'
o
Vertical 45
:
1.0'
o
Horizontal 90
or T:
4.0'
o
Horizontal 45
:
2.0'
o
* Long runs of flex or PL vent pipe installed directly vertical from the flue
stub may require more frequent cleaning due to fly ash falling off inside
and collecting directly above the combustion blower outlet.
Any use of horizontal venting will require more frequent cleaning. It is the
responsibility of the installer to make sure the entire flue configuration is
accessible for cleaning.
4" stainless steel flex vent piping is only allowed for use
in masonry fireplaces and chimneys or factory built wood
burning fireplaces with class A metal chimneys. All pellet vent
pipe must be secured together either by means provided by
pipe manufacturer or by 3 screws at each joint.
1 5
+
+
and 4 lineal ft. horizontal*
o
Harman® • XXV Installation Manual_R23 • 2004 -___ • 08/13
Use only the specified venting components. Use of any
other components will void the product warranty and
may pose a hazard.
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.
INSTALL VENT AT CLEARANCES SPECIFIED BY THE
VENT MANUFACTURER
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.
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.
3-90-00684i
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