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Bard part 137-178 (Front Fill) is an OEM sheet metal fill piece used on select Bard wall mount and packaged HVAC cabinets to close off and support the front air path area around the intake and filter section. A correct front fill helps maintain proper airflow routing, reduces air bypass that can lead to nuisance issues like sweating or uneven filtration, and restores the cabinet fit after service work or corrosion damage. As a genuine Bard replacement, 137-178 is intended to match factory dimensions for a clean, secure fit; confirm compatibility by matching your unit model and serial to the Bard parts list before ordering.