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The Bard 553-613BX is an OEM filter door assembly (boxed) used on Bard wall mounted HVAC equipment to secure and seal the return air filter access opening, helping maintain proper airflow while keeping the filter seated in the correct position. This part is commonly referenced in Bard free cooling air hood assemblies as the filter door, and it is a direct fit replacement when the original door is bent, damaged, or no longer latches cleanly. Use the exact part number from your unit or parts list to confirm compatibility before ordering, since Bard may use different filter door sizes across model families.
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.