Developed by NASA scientists and approved by the FDA, Airocide Air Purifiers are different from other air purifiers. They do not use filters or trap harmful particulates and molecules, so there is nothing to clean. Instead, the air purifiers destroy harmful pathogens on contact. These units have been cientifically tested over the last 12 years by independent universities, air quality labs, and governmental agencies. They've also been used in operating rooms, intensive care and pediatric units. Now, they are available for residential use. Airocide air purifiers have clean lines and sleek designs that complement any decor. They will leave your home with pure, clean, crisp air.