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Bard part number 538-151 is an OEM Exhaust Duct Assembly used to route and discharge exhaust air from compatible Bard HVAC equipment, supporting proper ventilation and safe, efficient operation. This duct assembly is built to factory fit and aligns with the unit cabinet and internal airflow path so the system can expel air as intended without unwanted leakage or restriction. For best results, confirm the unit model and serial number to verify compatibility before ordering, especially when replacing damaged or missing ductwork that can affect ventilation performance.