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Bard part 921-0043 is an Inner and Outer Fan Sleeve Service assembly for compatible Bard IWS-C wall sleeve applications, used to restore the proper airflow path and separation at the intake and exhaust openings behind the louver. In the field, worn, damaged, or loose fan sleeve sections can lead to recirculation, reduced capacity, and nuisance service issues, so replacing the fan sleeve assembly helps the unit move air the way it was engineered to. As a genuine Bard OEM service part, 921-0043 is intended to match factory fit and alignment on the correct models; confirm model and serial compatibility before ordering since wall sleeve configurations vary by series and build.