The 25X20 4'' Filter Base Fan/Coil by Southwark Metal Mfg Co is engineered for superior air filtration and circulation in HVAC systems. This unit features a 4-inch depth, accommodating standard filters for enhanced air quality. With dimensions of 25x20 inches, it fits seamlessly into various installations, ensuring compatibility with existing systems. Made from durable materials, this filter base is built to withstand daily use while maintaining high performance. Ideal for both residential and commercial applications, it enhances airflow and filtration efficiency.