The core of purifying your air and replacing it, this 2-in-1 filter is essential for optimal performance of your TruSens Z-1000 Small Air Purifier. It combines a carbon pre-filter for capturing large particles like hair and dust with a HEPA type filter for trapping small particles. 360-degree filtration draws in air from all directions, collecting pollutants such basic household odors and airborne allergens. Carbon prefilter captures odors and certain gasses and offers the first level of defense against dust and pet hair. HEPA Type filter removes pollutants as small as 0.3 microns, which is roughly 30 times smaller than a strand of hair.