Remove allergens, germs, bacteria and odours in any sized room with Germ Guardian's 28" Digital 4-in-1 Air Cleaning System. The three-layer system combines a HEPA filter, charcoal and PCO filter, and UV-C light technology to reduce exposure to indoor asthma triggers and allergens. Whisper-quiet operation means you notice the cleaner air and not the noise. | Germ Guardian 4-in-1 Air Cleaning System - Black