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The Bard CMC-31 is an OEM dirty filter switch kit used in Bard wall-mounted packaged air conditioners to help monitor filter restriction and signal when airflow across the filter has dropped due to loading. This kit is commonly applied on Bard small-cabinet wall mount units and is intended to restore the factory dirty filter indication function so maintenance staff can service filters before reduced airflow starts impacting comfort, coil performance, or equipment reliability. Use Bard model and serial information to confirm compatibility and follow the unit service literature for correct mounting location in the filter section and proper low-voltage wiring into the control circuit.