Amana-Goodman 2521301S Heat Exchanger is a critical furnace component designed to transfer heat safely and efficiently within compatible gas heating systems. It works by separating combustion gases from the circulating indoor air while allowing heat to pass through the metal surfaces, delivering warm air without mixing exhaust gases. Designed for use with compatible Amana and Goodman ... https://www.partshnc.com/heat-exchanger-amana-goodman-2521301s