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Bard part 9049-064 is a 7 inch BT barometric damper used in Bard wall mounted HVAC ventilation packages to automatically relieve or balance pressure and support consistent outside air exchange when the unit calls for it. As an OEM Bard component, this damper is built to fit the intended damper opening and operate smoothly with the factory ventilation configuration, helping reduce nuisance drafts and backflow issues that can show up when dampers are missing, stuck, or damaged. Verify the damper size and ventilation option on your unit data tag or parts list before ordering, since Bard ventilation assemblies can vary by model and cabinet configuration.