The York S1-373-28256-000 Heat Exchanger is an essential HVAC component designed to transfer heat efficiently within compatible York heating systems. It works by allowing combustion heat to warm the air circulating through the furnace while keeping combustion gases separate from the indoor air supply. This heat exchanger is primarily used in compatible York gas furnaces to support rel... https://www.partshnc.com/s1-373-28256-000-york-heat-exchanger