The Trane EXC01857 Heat Exchanger is a replacement component designed for compatible Trane HVAC heating systems. It transfers heat generated during the heating process to the circulating air while keeping combustion gases separate from the indoor air stream. This process supports effective heat distribution and consistent indoor comfort. Commonly used in compatible furnaces and heatin... https://www.partshnc.com/trane-exc01857-exchanger-heat