MINIPLEATED FILTER MEDIA minipleat pack was made from PP or fiberglass,available in MERV 15, MERV 14, MERV 13 and MERV 11( U15 ~ F7 )efficiencies mini-pleat HEPA ,for Clean Rooms and High Purity Applications. Mini-pleat HEPA are engineered to provide the optimum combination of efficiency and airflow. They are used in a wide range of applications, including pharmaceutical facilities, hospitals, biotech laboratories and other environments where control and removal of airborne contaminants is of paramount importance in the protection of people, processes, and equipment.