The High-Efficiency Air Outlet (HEPA Box) is the core terminal device for Class 1,000, 10,000, and 100,000 clean air conditioning systems. Its sealing and airflow organization directly affect the final result of the cleanroom. As a source factory integrating housing manufacturing and HEPA filter production, Deshengxin deeply analyzes ten key questions about HEPA Boxes. Covering differences from FFU, sealing technologies (gel seal vs. gasket), airflow regulation, material selection, PAO leak testing support, and customization capabilities. Understand how Deshengxin ensures reliable sealing and precise airflow through integrated manufacturing and professional technology.