The Midea 12120300005370 Rear Barrier Board Subassembly is a factory-engineered OEM airflow partition designed to manage and separate the indoor and outdoor air pathways inside your window air conditioner. This barrier ensures proper air circulation, prevents backflow, and maintains cooling efficiency by keeping hot exhaust air isolated from the evaporator section. A damaged or missing rear barrier board can lead to poor cooling, reduced efficiency, and overheating?making timely replacement essential. Key Features Genuine OEM subassembly for accurate fit and reliable performance Ensures proper airflow separation between hot and cold zones Prevents air recirculation, improving cooling capacity and energy efficiency Rigid, durable construction for long-term stability Restores factory cooling performance and system balance Specifications Part Number: 12120300005370 Component Type: Rear Barrier Board Subassembly Application: Window Air Conditioner Function: Airflow partitioning and internal thermal management Compatible Models (up to 10 models listed) RACWK1822ESCWU RACWK1513ESCWRU WWK15CW01N 311410577 WWK18CW02N MAW18H2ZWT MAW18S2WWT KSTAW18C 314790694 SW18R2H ?and more. Why Choose This Item This OEM Midea airflow barrier restores the precise internal air routing your AC unit requires. By preventing hot air intrusion into the cooling side, it improves efficiency, stabilizes system temperatures, and reduces compressor strain, helping extend the life of your air conditioner. If your unit shows reduced cooling or internal components appear exposed, this replacement is a critical fix.