Our recommendation for people with allergiesPeople with house dust allergies should look for a vacuum cleaner with a HEPA filter fitted as standard and specially sealed casing. These appliances guarantee that the air expelled from the vacuum cleaner is actually cleaner than usual indoor room air. Based on these characteristics, some Miele vacuum cleaners are specifically recommended for people with allergies by the TÜV Nord. In order for the appliance to maintain high filtration performance throughout its service life, the saturated, clogged HEPA filters must be replaced regularly - about once per year.