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The Bard 538-106BX FAD Assembly (boxed) is an OEM fresh air damper assembly used on select Bard wall-mount HVAC units to provide controlled outdoor air intake for proper ventilation and comfort. If your unit is sticking, leaking, or not bringing in the intended amount of outside air, replacing the complete damper assembly helps restore correct airflow management and supports reliable unit operation under the original Bard design. Because fresh air damper configurations vary by model and ventilation option, confirm compatibility by matching 538-106BX to your unit model and serial number 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.