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Bard part number 9049-063 is a 6 inch barometric damper used in Bard wall mounted HVAC ventilation sections to automatically regulate outside air intake based on building pressure. This OEM damper helps the unit maintain more consistent airflow for ventilation while preventing excessive drafts when pressure conditions change, making it a common service replacement when the damper blade binds, sticks, or does not move freely. Verify the required ventilation option and opening size on your Bard unit documentation before ordering to ensure proper fit and correct fresh air performance.