Harman® • P43 Installation Manual_R23 • 2008 -___ • 04/14
15
3-90-04301i
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 P43
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
o
and 4 lineal ft. horizontal*
If additional 4" PL Vent fittings are required, the overall
length must be reduced by:
Vertical 90
o
or T:
2.5'
Vertical 45
o
: 1.5'
Horizontal 90
o
or T:
5.0'
Horizontal 45
o
:
2.5'
3" PL Vent Pipe:
20 Lineal ft. vertical*
8 Lineal ft. vertical w/1-90
o
& 4 lineal ft. horizontal*
If additional 3" PL Vent fittings are required, the overall
length must be reduced by:
Vertical 90
o
or T:
2.0'
Vertical 45
o
: 1.0'
Horizontal 90
o
or T:
4.0'
Horizontal 45
o
:
2.0'
* 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.
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.
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.
INSTALL VENT AT CLEARANCES SPECIFIED BY THE
VENT MANUFACTURER
O
+
= Positive static pressure
= Negative static pressure
O
-
C. Venting & Use of Elbows
Figure 4.11
+
+
