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A metal surface located in between the hot combustion gases and the air that is circulating through the furnace. The hot combustion gases heat up the metal material of the heat exchanger, and the heat is transferred from the hot metal to the air passing through it. The warm air is forced through the ducts or pipes by a blower fan, and distributed to the rooms or areas of the building.

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1. A metal surface located in between the hot combustion gases and the air that is circulating through the furnace. The hot combustion gases heat up the metal material of the heat exchanger, and the heat is transferred from the hot metal to the air passing through it. The warm air is forced through the ducts or pipes by a blower fan, and distributed to the rooms or areas of the building.





 
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