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Bard part number 171-114 is an OEM heat exchanger intended for Bard heating equipment applications identified as F97 and FL110, restoring proper heat transfer from the burner side into the airstream while keeping combustion gases isolated from supply air. A failed or compromised heat exchanger can lead to poor heating performance and unsafe operation, so replacing it with the correct factory part is critical for fit, airflow alignment, and reliable burner operation. Verify the exact unit model and serial number application before ordering, since heat exchanger configurations can vary by cabinet size, firing rate, and burner section count even within similar Bard product families.