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Bard part number 111-189-8 is an OEM inner fan sleeve side used in Bard wall mounted and sleeve style HVAC installations where the sleeve assembly supports the indoor air path and helps keep the fan section properly aligned. This component is listed in Bard replacement parts literature as an Inner Fan Sleeve Side for the 4 1/2 inch deep IWS-A sleeve configuration, making it a fit-critical sheet metal piece that helps maintain correct airflow routing and reduces the chance of rattles or air bypass caused by damaged sleeve structure. If you are repairing a worn, bent, or missing sleeve side panel during a chassis or sleeve service, using the correct Bard OEM part ensures proper clearance and reassembly with the original sleeve components.