A heat exchange system and method for heating outside air provided to a structure
are disclosed. The system uses and recovers heat from waste products that are being
exhausted from the structure. A heated products source generates heated waste products
as a result of combustion. An exhaust duct passes the heated waste products through
a heat exchanger before exhaustion from the structure. An intake duct that supplies
fresh outside air to the structure also passes through the heat exchanger. The
heat exchanger couples the exhaust duct and the intake duct and transfers otherwise
unused heat from the waste products to the outside air to increase the overall
efficiency of the heated product source.
