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The Bard 538-107 Blower Box Assembly is an OEM air-moving compartment component used in Bard wall-mounted HVAC equipment to support proper blower airflow and keep the blower section sealed and aligned for correct air delivery across the indoor coil. Replacing a damaged or rusted blower box can help restore designed airflow, reduce air bypass that can affect comfort and coil performance, and prevent vibration or noise caused by poor fit. Because blower box configurations can vary by unit series and vintage, match Bard part number 538-107 to your equipment model and serial number before ordering to ensure proper fit and factory performance.