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NOTE:
It is recommended to install an outside air inlet with
a diameter of at least 4" in the room where the
heating appliance is installed (see drawing below).
It is preferable to choose a wall which is not
exposed to dominant winds, depending on the
conditions surrounding your house.
N.B. The owner of the furnace is responsible for the room's air quality in case of negative pressure or
temporary negative pressure.
If there is a fan in the wood storage room, make sure it does not create a depression in the room where the furnace is
installed.
For more information regarding the installation of fresh air intake adapter, refer to the option's manual.
9.12. HOT AIR PLENUM
The hot air plenum coming out of the furnace is to have a minimum height of 24" (610 mm). These dimensions for all
hot air furnaces are in accordance with the standards CSA B140.4, UL 391 and UL 727.
NOTE: TO ENSURE ADEQUATE STATIC PRESSURE, THE SYSTEM SHOULD BE BUILT IN A WAY THAT THE
VOLUME OF COLD AIR RETURN IS AT LEAST EQUAL OR SLIGHTLY HIGHER THAN THE VOLUME OF THE HOT
AIR DISTRIBUTION.
9.13. PARALLEL INSTALLATION
The installation of the Max Caddy with another furnace using the same ductwork is not allowed in Canada. This type
of installation is only allowed in the United States. Ideally, the maximum BTU input of the existing oil, gas, or
electric furnace should be equal or higher than the maximum BTU input of the wood furnace. It is mandatory to
respect minimum clearances between the ductwork and combustible material as if the wood furnace was installed as a
standalone unit. The ductwork and furnace should be adjusted in order to reach a static pressure of at least 0.20
IN.WC, but not more than 0.50 IN.WC. A back-flow damper should be installed in the plenum. The back-flow damper
assures that when either unit is operated by itself, the hot air will flow into the home, and not back through the other
furnace. Depending on your installation (see figures examples below), a back-flow damper may be required in each
plenum.
CANADA; The installation in parallel i.e. the Max Caddy furnace combined with another, using the same system of hot
air ducts is not allowed in Canada.
UNITED STATES; The installation in parallel i.e. the Max Caddy furnace combined with another, using the same hot
air duct system is allowed the United States.
26
Fresh air
intake
Exterior wall
Insulated pipe
(full length)
Free air
entry
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