What component of a furnace creates a current of air?

The component of a furnace that creates a current of air is the furnace blower. This critical part is responsible for circulating warm air throughout the living spaces of a building after it has been heated by the heat exchanger. When the furnace heats the air, the blower draws this air into the duct system and distributes it via vents.

The heat exchanger does play an important role in heating air but does not create the airflow itself; instead, it transfers heat to the air that is then moved by the blower. The exhaust flue is designed to expel combustion gases safely outside the building, and the combustion chamber is where the fuel is burned to create heat, but neither of these components is tasked with moving air throughout the space. Thus, the furnace blower is the correct answer, as it is specifically designed for the purpose of creating and directing airflow within the heating system.