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Bard part number 521-355 is an OEM Heat Exchanger Partition Assembly used in Bard HVAC heat exchanger sections to keep air paths properly separated so the unit can transfer heat as designed and avoid bypass or internal leakage that can hurt capacity and efficiency. If your original partition is warped, damaged, or missing, replacing it with the correct Bard factory part helps restore proper airflow management inside the heat exchanger compartment and supports reliable heating operation. Match this 521-355 assembly to your unit model and serial range before ordering, since Bard uses similar-looking partitions across different heat exchanger sizes and series.