QuietFlo® True HEPA Air Purifiers are Hunter's latest development in Air Purification Systems to improve the quality of the air you breathe. QuietFlo® Air Purifiers out-perform other air purification systems by quickly and effectively removing 99.97% of particles 0.3 microns in size from air that passes through the True HEPA filter. To extend the life and performance of the True HEPA filter, the activated carbon Prefilter traps lint, hair and large particles, and removes cooking, smoke and pet odors from the air for 30% better odor reduction.