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Bard 109-454BX is an OEM lower back panel used on select Bard wall mounted packaged HVAC units, providing the correct rear lower cabinet coverage and structural fit where the unit ties into the building opening and rear cabinet assembly. This stainless lower back component is made to match Bard factory dimensions so the cabinet seals and related panels align properly after service, helping protect internal components from weather exposure and airflow bypass that can impact performance. If you are replacing damaged or corroded rear cabinet sheet metal, 109-454BX is the right choice to restore proper cabinet integrity when ordered by exact part number and confirmed against the unit model and serial information.
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.