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Bard part number 171-113 is an OEM heat exchanger used in Bard gas heating sections for select F81, F80, and G90 series equipment. It is the primary combustion to air heat transfer component that allows the unit to deliver rated heating output while keeping flue gases separated from the supply air stream, which is critical for safe operation and proper efficiency. When you are replacing a heat exchanger due to cracking, corrosion, or repeated rollout and limit issues, using the correct Bard OEM assembly helps maintain the original fit in the burner compartment and proper alignment with the collector and venting components. Confirm model and serial compatibility before ordering, since heat exchanger designs and revisions can vary by unit configuration.