Hearthstone Quality Home Heating Products, Inc.
Heritage Model 8090 Pellet Stove
Page 16 of 53
Venting
H
- A vent must not be installed within 2 feet above a meter/regulator assembly when measured from the
horizontal centerline of the regulator
M
- The clearance under a veranda, porch, deck or balcony must be a minimum or 12”.
The minimum horizontal clearance to vegetation and other exterior combustibles such as mulch is 36” as
measured from the center of the outlet or termination cap. This 36” radius continues to grade up to a minimum
of 7 feet below the outlet.
The longer the vent pipe and more elbows used in the system, the greater the flow resistance. Therefore, we
recommend using as few elbows as possible, and 15 feet or less, of vertical vent pipe. The maximum horizontal
run should not exceed 10 feet. If more than 15 feet of pipe, or two 90° elbows are required, vent pipe size
should increase to 4”, as larger piping offers less flow resistance.
Please note that pellets are a wood product and soot may occur during startup while the firebox approaches
sufficient temperature to sustain complete combustion of fuel.
Soot and Flyash: Formation and Need for Removal- The products of combustion will contain small particles of
flyash. The flyash will collect in the exhaust venting system and restrict the flow of the flue gases. Incomplete
combustion, such as occurs during startup, shutdown, or incorrect operation of the room heater will lead to
some soot formation which will collect in the exhaust venting system. The exhaust venting system should be
inspected at least once every year to determine if cleaning is necessary.
Your Hearthstone appliance can handle up to 10 feet or equivalent of horizontal venting. Please follow venting
manufacturer’s recommendations and required installation procedures. All joints for connector pipe shall be
required to be fastened with at least three screws. If vented horizontally, joints shall be made gastight with at
least three screws and high temperature silicone.
Before considering your installation to be complete, perform a leak test on your venting. Leaks are easiest to
see during startup. Look for leaks at the vent pipe joints. Use of an incense stick is recommended to find leaks.
Outside Air
WARNING: CONNECT THE STOVE TO OUTSIDE AIR WHEN REQUIRED!
We recommend you connect your Heritage Pellet Stove to an outside air source to achieve the most efficient
and productive operation. If using an existing masonry chimney for exhaust venting and using outside air
feature, ensure make-up air draws from the side of the building most likely to experience direct wind pressure
(upwind side). You can use a coaxial venting configuration (direct vent) if environmental negative pressure is a
problem in your installation (see illustration below). This situation become less likely the closer the make-up and
exhaust air piping are to each other.
Never draw outside air from an enclosed space (garage, unventilated crawl space, etc), as this would create a
negative pressure situation and potentially starve your appliance of combustion air, creating more soot and
reducing performance efficiency.
