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The Bard S170-238 heat exchanger assembly is an OEM replacement component used in Bard heating sections to safely transfer heat from the burner system into the supply airstream while keeping combustion gases sealed from indoor air. Replacing a worn, cracked, or corroded heat exchanger helps restore proper heat output, stable ignition and burner operation, and safe furnace performance in wall-mounted Bard equipment that uses this style of heat exchanger assembly. Because heat exchanger fit and BTU rating are application-specific, confirm the exact unit model and serial number and match all related burner components and gaskets per the Bard parts breakdown before ordering the Bard S170-238.