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3.2.7 PARALLEL INSTALLATION
Parallel installation with another furnace that shares the same ducts system is
not permitted in Canada. That type of installation is permitted in the USA only. In
parallel installation, the maximum heat input of the existing gas, oil or electric
furnace should be equal or superior to that of the wood furnace. Duct clearances
must be respected as if the wood furnace was installed a by itself. Necessary
adjustments must be made to the distribution ducts so as to maintain static
pressure between 0.20 and 0.05 in W.C. A back flow damper must be installed in
order to make sure that the hot air circulates to the house and does not flow back
through the plenum of the unused furnace. Depending on the type of installation,
a damper may have to be installed in the plenum of both furnaces.
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