Cleanliness For Comfort Airclean Filter SystemThe Miele Airclean Filter System Filters More Than 99.9% Of All Fine Dust Particles. Active Airclean FilterAlso Neutralizes Unpleasant Odors - Ideal For Pet Owners. Hepa Airclean FilterFilters Even Fine Dust And Allergens - Ideal For Those With House Dust Allergies. Features Genuine Original Miele Exhaust FilterSome Original Miele Exhaust Filters Are Equipped With A Time-Strip - A Air Flow Indicator.