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The Bard S121-353 blower partition assembly is an internal sheet metal component used inside select Bard wall-mount HVAC units to separate the blower section from adjacent compartments and help keep airflow moving through the intended path. A properly fitted partition helps reduce air bypass that can hurt temperature control and can also support correct alignment of nearby components in the air-handling area. If the original partition is bent, rusted, or missing after prior service, replacing it with the OEM Bard S121-353 helps restore the factory internal air separation the unit was designed around; confirm fit by matching your unit model and serial to the correct parts list before ordering.