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Bard part number 8602-010 is an OEM 18 x 30 damper used in Bard HVAC air distribution and ventilation assemblies to regulate airflow through the unit as operating modes change. When a damper is bent, binding, or not sealing correctly, it can lead to poor ventilation control, comfort complaints, and inefficient operation, so replacing it with the correct Bard factory part helps restore proper airflow management and fit within the original damper opening. Confirm the required size and match the part number to your Bard model and serial, since dampers are often application-specific to the unit’s economizer or intake/exhaust arrangement.