Wet Dust Can't Fly® The Rainbow uses Mother Nature's most powerful element, water, to trap dirt and odors, returning only naturally clean, water-washed air to your home environment. The Rainbow is certified asthma & allergy friendly™ by the Asthma and Allergy Foundation of America. The Association of Home Appliance Manufacturers (AHAM) certifies that the Rainbow is a proven air cleaner designed to reduce air pollutants that contribute to poor indoor air quality. The Rainbow has met the Carpet Industry Standard for all three elements: soil removal, dust containment and carpet appearance.