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Bard 920-0076 is an OEM exhaust damper assembly used with Bard QW2-5S series ERV ventilation packages to help control and direct exhaust airflow as the ERV operates, supporting proper building pressure and reliable ventilation performance. This damper assembly is designed to fit and function with the factory ERV exhaust path so the damper opens and closes as intended during occupied ventilation and exhaust operation. Because ERV and ventilation accessories vary by unit series and airflow configuration, confirm your wall-mount model and ERV accessory match the QW2-5S application before ordering to ensure correct fit and operation.