Since its founding in 1899, Miele has made innovation a cornerstone of its business philosophy. One of the most impressive engineering feats pioneered by Miele is its production of the world's first HEPA-certified vacuum cleaner. The certified high-efficiency particulate air filters used in this Miele vacuum cleaner trap and retain 99.9% of all fine particles that are 0.3 microns, as well as larger substances such as pollen, dust mites, and other indoor air pollutants that are directly responsible for asthma and allergy symptoms. The Miele vacuum cleaner filters have been certified by the DMT Institute in Essen, Germany, using the EN 1822 filtration standard, which is the most stringent HEPA filter test standard in the world. When combined with Miele’s Sealed System construction, HEPA-certified Miele vacuums provide hygienic cleaning and air purity that are second to none.