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Bard 521-459 is an OEM Partition Insulation Assembly used inside select Bard wall mount and packaged HVAC units to help isolate compartments, reduce heat transfer between sections, and support proper airflow separation for stable performance. This insulation assembly is typically fitted to an internal partition area and is important for maintaining normal operating temperatures around key components while also helping limit cabinet noise and vibration. As a genuine Bard replacement part, 521-459 is intended to match factory fit and placement, so verify your unit model and serial number or the illustrated parts list before ordering to confirm the correct insulation configuration for your specific Bard equipment.