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Bard part 539X275 is the Right Cassette Plate Insul, an OEM insulation plate used on Bard wall mounted HVAC equipment to help isolate the cassette area from heat transfer and vibration while supporting proper cabinet sealing and airflow management. Replacing damaged or missing insulation in this location can reduce unwanted condensation, minimize air leakage, and keep the unit operating the way Bard engineered it. As a genuine Bard replacement part, 539X275 is intended to match the original fit and placement so your service repair goes smoothly when you verify the correct application by model and serial number.