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The Bard 520-172 blower partition assembly is an OEM internal sheet metal air separator used in Bard wall mounted HVAC units to divide the blower section from adjacent compartments, helping the unit maintain correct airflow routing across the indoor coil and through the supply air path. Replacing a damaged or missing partition can help prevent air bypass, reduce turbulence and noise, and support proper system performance by keeping the air stream where Bard designed it to be. As with most cabinet internal partitions, confirming the unit model and serial number against the correct Bard parts list before ordering is the best way to ensure a proper fit.