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Bard part 8601-031 is an OEM RC6 barometric damper used on Bard wall mounted HVAC equipment to regulate outside air intake using natural pressure and blower operation, helping maintain proper ventilation while the unit runs and closing when airflow stops. This damper assembly is designed to fit specific Bard ventilation configurations and supports consistent mixing of outdoor and conditioned air, which can reduce comfort complaints and help the system operate as intended. Because ventilation options and cabinet layouts vary by model and vintage, confirm the unit model and serial number and match the existing RC6 damper style before ordering to ensure correct fit and linkage alignment.