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If you use black plastic corrugated culvert pipe underground, it should not exceed 25’ and by using this
type of pipe, you run the risk of reducing the furnace’s efficiency and air flow.
DO NOT USE FLEX
DUCT INSIDE PVC OR CULVERT PIPE.
A basement window is an excellent location for running the hot air duct vent as well as the vent for the
cold air return. The cold air flex duct is an integral part of the system and must be used when installing
the furnace - failure to use the cold air return will pressurize the home causing the furnace not to work
properly. It is permissible to run your electric through the cold air return duct. If a basement window
is not available, you may access the home through a window or wall for both the plenum and air return.
Mobile Home:
Both the hot air duct and cold air return duct may be accessed through the floor or wall in a
mobile or modular home.
Always keep your wood covered year round.
Dry wood will produce more Btu output
and a longer burn time.
.