The Honeywell Air Genius 5 HFD320 comes equipped with a permanent filter that effectively removes up to 99.9% of microscopic allergens and 0.3 microns or larger from the air that passes through the filter. You'll never need to purchase an additional filter. Simply remove and wash your existing permanent filter and you'll be good to go! Featuring 2 optional pre-filters, the Honeywell AirGenius comes with a washable foam pre-filter and an odor-reducing pre-filter which effectively removes harmful gasses and VOCs. This air cleaner's smart controls are unique and greatly assist in the removal of guesswork regarding the cleanliness of your surrounding air. The HFD320 circulates air in a room up to 5 times an hour and greatly reduces the amount of dust, pollen, pet dander and smoke allergens in the air. This unit features an additional 5 air clean settings and smart controls that make the process of selecting your settings all the more easier.