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The Bard 9041-009 heat exchanger is an OEM replacement component used in Bard wall mounted gas heating sections to transfer heat safely and efficiently from the burner flame into the supply air stream. If you are servicing a Bard unit where the heat exchanger is cracked, leaking combustion byproducts, or failing inspection, replacing it with the correct factory part helps restore proper heating performance and maintains the intended combustion and airflow path. This part is commonly referenced by Bard as a heat exchanger for H105S and H120S applications, so verify compatibility by matching your complete unit model and serial number to the correct parts list before ordering.