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Bard part number S171-247 is a 125K BTU heat exchanger assembly used in Bard wall mounted gas/electric HVAC units to transfer heat safely and efficiently from the burner section into the supply airstream. If you are diagnosing a cracked or leaking exchanger, flame rollout issues, or failed heat exchanger inspection, replacing the exchanger assembly with the correct Bard OEM part helps restore proper combustion venting and reliable heating performance while maintaining the intended fit within the furnace section. Because heat exchangers are model and heating input specific, confirm compatibility using your unit model and serial number or the Bard parts list before ordering to ensure the S171-247 heat exchanger assembly matches your equipment.