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Bard part number 139-186-4 is a fresh air wrapper used in the unit ventilation section to help form and protect the fresh air intake path so the damper and related ventilation components seat correctly and outside air is directed where it should be. In the field, a damaged or missing wrapper can lead to air leakage, rattles, and poor ventilation performance, so replacing it with the correct Bard OEM wrapper helps restore proper fit, airflow control, and reliable operation. Verify compatibility by matching the unit model and serial number and confirm orientation before installation so the wrapper aligns with the factory fresh air damper assembly components.