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Bard part number 171-105 is an OEM heat exchanger assembly used in Bard H105 and H120 wall-mounted gas/electric units, restoring proper combustion-to-airstream heat transfer when the original exchanger is damaged, cracked, or leaking. Because the heat exchanger is the primary safety and performance component in the heating section, replacing it with the correct Bard factory part helps maintain designed temperature rise, reliable ignition and venting operation, and safe separation of flue gases from supply air. Verify the exact unit model and serial number before ordering to confirm application, since heat exchanger configurations can vary by furnace size and revision within the same series.