The Rheem-Ruud AS-100560-01 Heat Exchanger is a replacement heating component designed for compatible Rheem and Ruud gas furnaces and residential HVAC systems. It transfers heat from the combustion process to the circulating air while keeping combustion gases isolated from the indoor airflow for safe and efficient operation. Engineered for durability and effective heat transfer, this ... https://www.partshnc.com/heat-exchanger-74