What component in a gas furnace allows air within the furnace to blend with combustion products?

The component in a gas furnace that allows air within the furnace to blend with combustion products is the heat exchanger. The heat exchanger is a crucial element in the furnace, where it facilitates the transfer of heat from the combustion gases (which are a mixture of air and gas products from burning fuel) to the air that is circulated throughout the home.

As combustion occurs, the heat exchanger warms up and enables the surrounding air to absorb this heat, ensuring efficient heating of the living space. The design of the heat exchanger also serves to safely separate the combustion gases from the air that is being used for heating to prevent any harmful gases from entering the dwelling.

In contrast, the diverter, blower, and duct serve different functions in the overall operation of the furnace. The diverter directs the flow of gas or fumes, the blower is responsible for circulating air throughout the system, while the duct is the pathway through which heated air travels to different areas of the home. Therefore, the heat exchanger is specifically the component responsible for blending the indoor air with the combustion products for efficient heat transfer.