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Bard 143-188BX is an OEM fill plate (boxed) used on select Bard wall mounted HVAC units and related accessories to close off a cabinet opening or unused knockout so the unit stays properly sealed. When this plate is missing or damaged, outside air, dust, and moisture can get pulled into the cabinet and disrupt designed airflow, which can lead to performance issues and nuisance service calls. Replacing it with the correct Bard part helps restore the factory fit and keeps the interior components protected, so your equipment operates the way Bard intended. Confirm compatibility by matching the full unit model and serial information and referencing the parts list for your specific configuration 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.