THE FUNCTION OF THE ADD-ON FURNACE
The Add-On Furnace is designed to be a supplemental hot air heating system that will
connect to your existing heating system. The furnace will operate independently of your
existing system while using the same hot air ducts that your present furnace uses. The
furnace comes standard with a 850 CFM blower that pushes hot air up both sides and across
the top of the unit through an inner-duct chamber built around the firebox. The heated air
exits the unit through a six-inch outlet located on the top, near the front of the furnace. The
six-inch pipe connected at this exit will route the heated air into your duct system.
HOT AIR HOOK-UP
You first need to position your unit as close to the flue connector as possible and install your
flue pipe. Once this is done, you may hook your hot air outlet into your ductwork.
Located on the top, near the front of the unit is a six-inch opening for the mounting of the flue
collar. When mounting this part be absolutely sure it is fastened securely to the opening, as
this will be the hot air exit. Thirty gauge or thicker pipe should run from the top of the furnace
to the hot air trunk line of your existing hot air system. Using the least possible amount of
pipe will help the heat transfer to your duct system. Cut a six-inch diameter hole in the main
trunk line of the furnace duct, which is usually located on the top of the central furnace. Slide
the six-inch pipe from the wood furnace into the
hole and seal the connection with duct tape.
Thirty gauge or thicker black pipe should be used
for the first two feet and then thirty gauge or
thicker galvanized pipe can be used to connect
to the existing furnace duct. Sheet metal screws
should be used to secure each joint of pipe and
an aluminum heat resistant tape can be wrapped
around each joint to give an airtight seal.
NOTE
: Install a 6” 90 degree elbow
inside
Central Furnace plenum or
ductwork so that air flow from central
furnace will not be directed back into
the add-on furnace. (A 7” hole will be
required for this installation.)
Air Flow
NOTE:
This versatile, all-purpose heater can also
be used, for example, in a garage or shop
environment
without
ductwork – simply attach a 6”
elbow directly to the hot air outlet of the furnace,
and point the elbow in the direction you wish to
direct the air flow.
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