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Bard part 552-335-6 is an OEM hinged filter door assembly in slate, used on select Bard wall mount HVAC units to secure the air filter and provide quick access for routine filter changes and inspections. A properly fitting filter door helps keep return air from bypassing the filter, supports steady airflow across the indoor coil, and reduces the chance of nuisance dirt buildup inside the cabinet that can lead to performance issues. This replacement assembly is designed to match Bard factory fit and hinge alignment, making it a dependable option when the original door is damaged, warped, or no longer latching correctly. Confirm compatibility by matching the part number to your unit model and serial or the correct Bard parts list before ordering.