How a Furnace Works: Cold Air Intake to Hot Air Output Explained #114857 (License: Personal Use)

The image illustrates a cross-sectional view of a residential forced-air furnace, where cool air is drawn in from the bottom, passes through a filter and over a burning fuel source (e.g., gas burner), and is heated before being distributed via ductwork. Arrows indicate airflow direction-cold air entering left, heated air rising and exiting upward-and a visible heat exchanger bed (grated layer) separates combustion gases from the air stream for safety and efficiency.

Used on HVAC educational pages, home improvement guides, or contractor websites to explain furnace functionality to homeowners or students; matches user intent to understand heating system basics or troubleshoot airflow issues.