Venting
P38+ Pellet Stove
IMPORTANT NOTICE
Pellet Vent Pipe or PL Vent Pipe Must be used.
Fig. 7
+= Positive static pressure 
= Negative static pressure
Outside air flex pipe goes here
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
Flex pipe part#
Inlet Cover part#
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.
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