HEPA Filters and ULPA Filters Selection Guide | Engineering360
High efficiency particulate air (HEPA) filters and ultralow particulate air (ULPA) filters are air filters designed to trap a vast majority of very small particulate contaminants from an air stream.. HEPA Basics . Definition and Efficiency . Air filters must satisfy certain standards of efficiency — most commonly those developed by the US Department of Energy (DOE) — in order to qualify ...