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8
P68 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 flow resistance. Because of these
facts we recommend using as few 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 from 3" to 4" because a larger pipe
causes less flow resistance. Be sure to use ap-
proved pellet vent pipe wall and ceiling 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 acts as an insulator and
reduces the outside surface 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 P68 operates with a positive vent pressure
we specify that the joints also be sealed with
silicone. Aluminum tape can also be used for any
joint that is 1 ft. or more from the outlet of the stove.
We cannot emphasize enough, the
importance of sealing every seam and 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 during start-up. Alternatively you 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
+
+
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+
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Fig. 7
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