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Bard part 921-0042 is an OEM Inner/Outer Fan Sleeve service assembly for Bard IWS-B wall-mounted HVAC equipment, used to properly support and position the fan within the sleeve so airflow stays stable and the fan runs with correct clearance. If your unit has vibration, rubbing, or wear around the fan opening, replacing the fan sleeve assembly helps restore proper fan alignment and protects surrounding components from damage that can come from movement over time. Because this is a Bard factory service part, it is the right choice when you need dependable fit and function on IWS-B applications; confirm compatibility by matching your unit model and serial information before ordering.