3-90-00674R20_08/12
A combustion blower is used to extract the combustion
gases from the rebox. This causes a negative pressure
in the rebox and a positive pressure in the venting
system as shown in g. 46. The longer the vent pipe
and more elbows used in the system, the greater the
ow resistance.
4" Stainless Steel Flex: 30 Lineal ft. Vertical*
4" Pl Vent Pipe: 30 Lineal ft. Vertical*
4" Pl Vent Pipe: 14 ft. Vertical w/1-90
o
and 12 lineal ft. horizontal*
Vertical 90
o
or T: 2.5'
Vertical 45
o
: 1.5'
Horizontal 90
o
or T: 5.0'
Horizontal 45
o
: 2.5'
20 Lineal ft. vertical*
8 Lineal ft. vertical w/1-90
o
& 8 lineal ft. horizontal*
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 ex or PL vent pipe installed directly vertical from the
ue stub may require more frequent cleaning due to y 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 ue
conguration is accessible for cleaning.
4" stainless steel ex vent piping is only allowed for
use in masonry replaces and chimneys or factory built
wood burning replaces 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.
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.
O
= Positive static pressure
= Negative static pressure
Inside
hopper
Inside
rebox
In ue pipe
In fan
chamber
& starter
collar
O
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.
To Next Page
Loading...
Need help?
General
