Hunter 30915 Filter Pack Permanently Charged Electret Filter Effectively Captures 99.97% of Particles as Small as 0.1 Micron in Size from the Air that Passes Through the Filter. The HEPAtech Filter has 3 Different Filters that the Air is Strained Through. *Filter 1 is a Pre-filter - It Removes Large Dust Particles, Lint, and Hair from the Dirty Air. *Filter 2 is the Sub-Micron Filter - It Captures 99.9 % of All Airborne Particles as Small as .1 Microns from the Air. *Filter 3 is the Activated Charcoal Filter - It Absorbs and Help Eliminate Cooking Odors, Musty Air, Tobacco Odors and Pet Related Odors as it Freshens the Air. HEPAtech Replacement Filter Used by the Following Models: 30010, 30025, 30040, 37025