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Bard part 921-0120BX is an OEM fan shroud assembly (boxed) used to properly space, enclose, and guide airflow through the fan section on compatible Bard wall-mount HVAC equipment. A correct shroud helps the fan move air the way the unit was engineered to, which supports stable head pressure, efficient heat rejection, and reduced recirculation around the condenser area. If the original shroud is cracked, bent, or missing, replacing it with the correct Bard 921-0120BX assembly is a straightforward way to restore proper airflow alignment and keep the fan and coil area protected during normal operation.
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.