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The Bard 910-2055 Filter Switch Assembly is an OEM air-proving control used to monitor filter restriction in select Bard wall-mounted HVAC equipment by sensing a rise in differential static pressure across the filter section and signaling the unit controls when airflow is being reduced by a dirty or loaded filter. Replacing a failed or damaged filter switch assembly helps restore proper dirty filter indication and protects system performance by prompting timely filter service before low airflow leads to comfort complaints, coil icing, or unnecessary service calls. As a genuine Bard replacement part, 910-2055 is built for correct fit, reliable switching, and straightforward field replacement when matched to the exact unit model and revision in the Bard parts list.