Harman® • P35i-C Installation Manual_R2 • 2019 -___ • 02/20
14
8390-784i
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 4.6. The longer the vent pipe and more
elbows used in the system, the greater the flow resistance.
The recommended maximum flue lengths for the P35i-C
Pellet Insert are as follows:
4" Flex Pipe:
Maximum 30 Ft. Vertical
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.
INSTALL VENT AT CLEARANCES SPECIFIED BY THE
VENT MANUFACTURER.
B. Venting & Use of Elbows
+
= Positive static pressure
= Negative static pressure
Inside
hopper
Inside
firebox
In flue pipe
In fan chamber
& starter collar
+
+
-
-
-
Figure 4.6
