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P38+ Pellet Stove
9
+ = Positive static pressure
= Negative static pressure
Fig. 7
Outside air flex pipe
goes here
Inlet Cover part#
1-10-08542
Flex pipe part#
2-00-08543
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 fig. 7. The longer the vent pipe and more elbows used in the
system, the greater the flow resistance. Because of these facts
we recommend using as few elbows as possible and 15 feet
or less of vent pipe. The maximum horizontal run should not
exceed 48". If more than 15 feet of pipe is needed, the diam-
eter should be increased from 3" to 4" because a larger pipe
causes less flow resistance. Be sure to use approved pellet
vent pipe and wall pass through fittings.
Vent Pipe
Pellet venting pipe ( also known as PL vent ) is con-
structed of two layers with air space between the layers. This
air space acts as an insulator and reduces the outside sur-
face temperature to allow a clearance to combustibles of only
3 inches. The sections of pipe lock together to form an air tight
seal in most cases; however, in some cases a perfect seal is
not achieved. For this reason and the fact that the 38+ oper-
ates with a positive vent pressure we specify that the joints
also be sealed with clear silicone.
Outside Air
Outside air is optional except in mobile homes and
where building codes require. The benefit of outside air is
increased efficiency and should be used in small, or very well
insulated homes.
To install outside air use 2 3/8" I.D. flex pipe part number
2-00-08543. There is a break-away hole on the rear panel
which must be removed before connecting the flex pipe. The
pipe should be run outside and terminate to the side or below
the vent pipe outlet so the flue outlet is more than 12" from the
inlet cover. The maximum length run of this pipe is 15 feet. If a
longer run is needed the size must be increased to 3". Inlet
cover part number 1-10-08542 should be used to keep bird,
rodents etc. out of the pipe.
HRV
When installing in a house with a Heat Reclaiming Ven-
tilation System (HRV) be sure the system is balanced and is
not creating a negative pressure in the house.
Venting
IMPORTANT NOTICE
Pellet Vent Pipe or PL Vent Pipe Must be used.