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Bard 5070-004 is an OEM 3 ton WERV cassette wheel used in Bard wall mounted ventilation equipment to move air through the WERV cassette and help the unit maintain designed airflow and ventilation performance. A worn or damaged wheel can lead to reduced airflow, noise, vibration, and uneven ventilation operation, so replacing it with the correct Bard factory part helps restore proper balance and fit without modification. Because WERV cassette components can vary by unit configuration, confirm compatibility by checking your Bard model and serial number or the applicable parts manual before ordering to ensure the correct match.