The Rheem-Ruud AS-100561-01 Heat Exchanger is a high-quality replacement component engineered to efficiently transfer heat within compatible Rheem and Ruud furnaces and other HVAC heating systems. It works by transferring thermal energy from the combustion process to the circulating air while keeping combustion gases safely separated from the indoor airflow. Designed for dependable pe... https://www.partshnc.com/heat-exchanger-73