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In this type of system, air is heated in a furnace and blown by a fan through a network of ducts to the rooms of a dwelling.

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Duct directing air from a room back to the furnace to be reheated.

Device creating heat and blowing the air through the duct system.

Joining duct between the furnace and the hot-air distribution system.

Connection or part of a duct for altering the direction of the hot air.

Vertical duct carrying hot air upward toward the registers on the upper floors.

Mechanism for regulating the volume of air passing through a duct.

Duct that leaves the furnace and carries hot air toward the branch ducts.

Duct, usually made of sheet metal, carrying the hot air toward the registers.

Adjustable grill located at the end of a duct through which hot air is distributed throughout a room.