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The Bard 136-887BX Return Adjustment Plate - Box is an OEM sheet metal airflow component used in Bard wall mounted packaged HVAC equipment to help set and stabilize the return air opening so the unit pulls the correct amount of indoor air across the filter and indoor coil. If a return opening has been damaged, modified, or is not sealing correctly, replacing this plate can help restore proper airflow balance and reduce nuisance issues tied to low airflow, such as poor cooling performance, coil frosting, or uneven temperatures. This part is intended for fit and function on Bard cabinet assemblies that use a return air adjustment plate, so confirm compatibility by matching the full part number and verifying against the 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.