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Bard 509-411BX is an OEM Upper Back assembly supplied boxed, used on select Bard wall mount HVAC units as the upper rear cabinet structure that helps close off and support the outdoor section of the unit. Replacing a damaged or corroded upper back panel helps maintain proper airflow separation and protects internal components from weather exposure, which is especially important for reliable operation in harsh environments. Because cabinet panels vary by model series and generation, confirm fit by matching your unit model and serial information to the correct parts listing before ordering.
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.