As of 2015, Dyson does not manufacture or sell air purifiers, but their vacuum cleaners, humidifiers and fans contain some air purification features. The advantages of these products are anti-microbial properties and the filtering of allergens.
Dyson humidifiers don't filter allergens or other impurities from the air, but they use anti-microbial technology to eliminate an estimated 99.9 percent of bacteria from the water tank. Stopping bacterial growth in the water tank prevents disease-causing germs from being released into the room. The humidifiers kill bacteria using ultraviolet light, which means there are no filters to clean or replace.
Dyson fans and space heaters filter dust from the air before circulating it, making it as clean as possible. This also minimizes burning smells from the space heaters, because no dust burns on the heating element. These models are not rated for anti-bacterial or anti-allergen performance. Dyson advertises that their fans use 30 percent less energy than competing products, giving them an efficiency advantage.
Dyson vacuum cleaners purify air by filtering allergens and dust when used. These air filters are more powerful than standard HEPA filters, and they remove particles as small as 0.5 microns from the air. They are tested for filtering efficacy on a variety of flooring types, including carpet, wood and tile.