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Bard part number 171-126 is an OEM heat exchanger for the Bard IL145 series high economy gas fired furnace, replacing the critical combustion air-to-air heat transfer component that delivers safe, consistent heat to the airstream while keeping flue gases isolated. When a furnace shows signs of exchanger failure such as corrosion, cracks, or rollout related shutdowns, installing the correct Bard factory heat exchanger helps restore proper heat output and maintain the original safety design and airflow characteristics. Because heat exchangers are model and vintage specific, confirm your complete unit model and serial number before ordering to ensure 171-126 is the correct match for your IL145 configuration and associated cabinet layout.