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The Bard 121-135 blower partition assembly is an OEM internal sheet metal component used in the blower section of select Bard wall-mount air conditioners and heat pumps to separate air paths and keep airflow moving through the correct passages. A damaged or missing partition can lead to air bypass, reduced comfort, and uneven performance, so replacing it with the correct Bard part helps restore the intended airflow separation, blower compartment sealing, and overall system efficiency. Verify fit by matching the part number to your Bard model and serial, since blower compartment layouts can vary by unit series and vintage.