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Bard part number 506-173 is an OEM top assembly used on select Bard wall mounted HVAC units to restore the proper top cover structure and protection after damage, corrosion, or service work. A correct fitting top assembly helps keep the cabinet aligned, supports the unit’s overall rigidity, and helps shield internal components from weather exposure that can lead to premature wear. Because top assemblies can vary by unit family and cabinet size, match 506-173 to your Bard model and serial to confirm application before ordering, especially when multiple cabinet revisions exist across similar models.