8P68 Pellet Stove
Venting
A combustion blower is used to extract the com-
bustion gases from the firebox. This causes a nega-
tive 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 f low resistance. Because of these
facts we recommend using as fe w elbows as pos-
sible 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 interior diameter should
be increased f rom 3" to 4" because a larger pipe
causes less flow resistance. Be su re to u se ap-
proved pellet ven t pipe wal l and ceil ing pass-
through fittings to go through combustible walls
and ceilings. The use of a starting collar is not al-
ways necessary. The first piece of pipe should be
fastened securely with at least 2 fasteners to the
flue collar of the stove. If a starting collar is used to
attach the venting system to the stove, the starting
collar must be sealed to the stove with high temp
silicone caulking.
Vent Pipe
Pellet venting pipe ( also known as PL vent )
is constructed of two layers with air space between
the layers. This air space a cts as an insulator and
reduces the outside surface temperature to allow a
clearance to co mbustibles of only 3 inches. The
sections of pipe lock together to form an air tight seal
in most cases. Ho wever, in some cases a perfect
seal is not achieved. For this reason and the fact
that the P68 operates with a positive vent pressure
we specify that the joi nts also be sealed wi th
silicone. Aluminum tape can also be used for a ny
joint that is 1 ft. or more from the outlet of the stove.
We canno t emphasi ze enough, the
importance of sea ling every seam a nd joint in the
venting system which is inside the home. Even the
smallest pin hole can leak and when it does you will
smell wood smoke or a creosote smell in the room.
If this occurs check for leaks. Leaks are easiest to
see duri ng start-up. Alternatively yo u can use a
smoke pellet to leak test the venting before lighting
your first fire.
Venting
IMPORTANT NOTICE
Pellet Vent Pipe or PL Vent Pipe Must Be Used.
= Positive Static Pressure
= Negative Static Pressure
++-+
-Fig. 7
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