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The Bard 521-354 Heat Exchanger Partition Assy is an OEM internal sheet metal divider used within the heat exchanger section of select Bard wall-mounted HVAC units to properly separate airflow paths and maintain correct internal compartment sealing for stable heat transfer and safe, efficient operation. If the original partition is bent, rusted, or missing, replacing it with the correct Bard factory part helps restore proper air management through the heat exchanger assembly and supports dependable unit performance. Confirm compatibility by matching the part number 521-354 to your Bard unit model and serial information before ordering.