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The Bard 139-174 Cassette Plate Assembly is an OEM replacement plate-style component used in compatible Bard HVAC equipment to help keep internal cassette components properly supported and positioned so the unit can operate as designed. When a cassette plate is bent, worn, or missing, it can contribute to vibration, fit-up issues during service, or airflow and performance problems that show up after other repairs. Replacing it with the correct Bard 139-174 part helps restore proper alignment and serviceability, and it is best to confirm compatibility by matching your unit model and serial number to the Bard parts list before ordering.