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Bard part number 139-110 is an OEM Left Seal Assembly used on Bard Q-TEC EVR (energy recovery ventilator) assemblies to help close off the left-side sealing surface around the ERV cassette and blower box area. A worn or missing seal can allow air bypass, which reduces ventilation effectiveness and can contribute to unwanted noise or air leakage where the cassette interfaces with the cabinet. Replacing 139-110 restores the intended airflow path so your Bard ERV can deliver proper fresh air exchange and maintain designed performance. Confirm fit by matching the part number to your unit or the Bard parts list for your specific Q-TEC EVR configuration before ordering.