After the air is heated in the heat exchanger section, it leaves the furnace via which component?

In a heating system, after the air has passed through the heat exchanger and has been heated, it exits the furnace through the plenum. The plenum is a critical component that serves as the distribution chamber for the heated air, allowing it to be evenly distributed throughout the ductwork connected to the system.

The design of the plenum ensures that the air is effectively transferred from the heat exchanger to the ducts, maintaining a consistent airflow and pressure. This component is essential because it plays a vital role in the overall efficiency of the heating system, ensuring that all parts of the space being heated receive adequate warmth. Ensuring that air leaves the heat exchanger through the plenum helps manage airflow, temperature consistency, and system balance within the heating setup.

While ducts are responsible for carrying the heated air to different areas of a building, the air first enters the plenum after leaving the heat exchanger, making the plenum the correct choice in this context.