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3.11 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.
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