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Bard part number 539Y275 is the left cassette plate insulation used in certain Bard wall mounted HVAC units to reduce heat transfer and help keep the cabinet and air path properly insulated for stable unit performance. As an OEM Bard replacement, it is intended to match the original fit and placement on the left side cassette area so you can restore the factory insulation layout after service work or when damaged insulation starts to deteriorate. Confirm compatibility by matching your unit model and serial information to the correct Bard parts list before ordering, since cassette components can vary by series and configuration.