The International Comfort Products 1193895 Primary Heat Exchanger is a key component in compatible gas furnaces, designed to transfer heat from combustion gases to the circulating indoor air. As the furnace operates, the heat exchanger contains the combustion gases while allowing heat to pass through its metal surfaces, warming the air distributed throughout the building. This replace... https://www.partshnc.com/international-comfort-products-1193895-primary-heat-exchanger