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The Bard 521-339 Heat Exchanger Partition Assy is an OEM internal sheet metal divider used in Bard packaged wall mount equipment to separate and support sections around the heat exchanger area for proper airflow routing and safe, consistent operation. If your original partition is damaged, warped, or missing after a service repair, replacing it helps restore the unit’s intended internal air path and reduces the chance of heat related stress on nearby components. As a genuine Bard replacement part, 521-339 is built to match factory fit and mounting points, making it the right choice when you need a dependable drop-in partition assembly for a correct repair.