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Bard part 521-380 is an OEM partition assembly used inside select Bard wall mounted HVAC units to separate internal air paths and compartments so the blower section and surrounding components operate as designed. A correctly fitted partition helps maintain proper airflow direction, reduces air bypass, and supports stable temperature control by keeping return and supply areas from mixing. This is a direct replacement Bard factory part intended to match original mounting points and clearances, making it a reliable choice when a damaged or missing partition is causing airflow problems, noise, or service access issues. Verify fit by matching the part number 521-380 to your Bard unit model and serial data before ordering.