AC1-0016-06 The carbon pre-filter absorbs odors and traps larger particles. 97% of airborn particles and allergens down to . Together, they trap dust, pollen, pet dander, smoke, bacteria, mold spores, dust mites and more. The Vornado® AC 500 Whole Room Air Purifier uses true HEPA filtration–the most effective filtration available–to remove up to 99. The AC 500 uses both HEPA and carbon filters. Without circulation, the air cleaner is only cleaning the immediate area around the unit. 3 microns. The Whole Room Purifier actively circulates and filters all the air throughout a room.