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The Bard S111-280-8 Outer Wall Sleeve Assembly is an OEM structural sleeve used on select Bard wall-mounted HVAC units to create a solid, properly sized opening through the wall and help support correct unit placement at the building penetration. Replacing a damaged or corroded wall sleeve helps restore proper fit-up between the unit and the wall opening, which can reduce air leakage points and prevent alignment issues that lead to vibration, noise, or water intrusion around the installation. For best results, confirm compatibility by matching S111-280-8 to your unit model and service literature before ordering, since sleeve configurations can vary by series and cabinet size.