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The Bard 139-171 cassette plate assembly is an OEM internal sheet metal component used in certain Bard HVAC cassette-style assemblies to support correct fit-up and positioning of related internal parts so the unit can be reassembled properly after service. When a plate is bent, cracked, or stripped from repeated maintenance, replacing it with the correct Bard 139-171 helps restore factory alignment, reduces vibration and rub points, and makes routine access and reinstallation more straightforward. For best results, confirm the part number against your Bard model and serial information or the unit parts list to ensure proper application and interchange.