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Bard 137Y578BX is an OEM left side fill panel supplied boxed for protection in transit and storage, used on Bard wall mounted HVAC equipment to close off the left side opening and restore proper cabinet sealing and airflow control. This exterior cabinet component helps prevent air bypass and helps keep the unit operating as designed by maintaining the intended air path through the filter and coil sections. This listing is for the panel only. Reuse your existing fasteners, clips, and hardware, and confirm fit by matching your unit model and serial information 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.