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Bard part number 171-106 is an OEM heat exchanger assembly used in Bard C140 and C160 gas heating sections, built to restore safe, efficient heat transfer and proper burner to flue performance when the original exchanger is damaged, leaking, or failing an inspection. In wall mounted Bard gas/electric equipment, the heat exchanger is the core component that separates combustion gases from the supply airstream, so using the correct factory replacement matters for fit, venting alignment, and overall reliability. Confirm compatibility by matching your unit model and serial number and comparing the existing heat exchanger style before ordering, since gas heat configurations can vary by production series and input rating.