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The Bard 553-521-1BX Filter Door Assembly is an OEM exterior cabinet component that closes off the return air filter access opening on compatible Bard wall mount and packaged units, helping keep the filter properly seated so the system can maintain designed airflow and protect internal components from dirt bypass. Finished in White textured enamel to match factory units. Ensure this matches the color of your Bard unit for seamless replacement. Bard exterior panels with enamel cabinet paint coating have been tested to withstand over 1000 hours of salt spray tests per ASTM B117-03. This listing is for the panel only. Reuse your existing fasteners, clips, and hardware.
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.