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Bard 113-543BX is an OEM short filter bracket supplied boxed for Bard wall-mount packaged air conditioners and heat pumps, used to support and retain the return air filter so it stays properly positioned during operation and service. A secure bracket helps prevent filter bypass that can contribute to coil dirt buildup and airflow issues, so this replacement is a smart fix when the original bracket is missing, bent, or no longer holding the filter tight. Because filter hardware layouts can vary by model and vintage, confirm fit by matching your unit model and serial information to the Bard parts list 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.