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Bard 521-478BX is an OEM condenser partition assembly used in select Bard wall mounted packaged units and related configurations to separate the condenser section from adjacent airflow paths and components, helping maintain proper air management through the outdoor side of the cabinet. This partition supports correct condenser fan airflow and helps prevent air recirculation that can reduce capacity and raise operating temperatures. If your existing partition is bent, rusted through, or missing after a major repair, replacing it with the correct Bard factory part helps restore the intended internal layout and service clearances for reliable operation.
Bard uses suffixes like "BX" to manage parts internally. These do not change the physical form or function of the part.
A part number ending in "BX" simply means it is packaged in a box for shipping, rather than for internal assembly use.
Example: 8406-142BX is physically identical to 8406-142.