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Bard part number 113-721BX is an OEM motor control bracket supplied boxed for service stock, designed to provide a rigid, properly aligned mounting location for motor control components inside Bard wall-mounted air conditioners and other packaged HVAC equipment. A solid bracket matters because loose or misaligned controls can lead to wiring strain, vibration issues, and nuisance electrical problems over time, so replacing a damaged or missing bracket helps restore factory-correct component support and service access. As with any control compartment hardware, confirm the part number against your unit model and serial information to ensure correct fit 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.