The Airthereal APH260 Air Purifier has 3 filtration stages, with nano mineral, cold catalyst filter, photo catalyst filter, and molecular, that filters out 99.97% of airborne particles as small as 0.3 microns. With a CADR rate of 152+CFM (260 m³/h), this air purifier can purify an area up to 355 sq. ft. You will notice the difference within 10 minutes. To automatically measure the air quality, turn on its smart control. The unit will choose the correct air purification mode according to your environment. Its replaceable air filter enables you to replace it when it lights up and keeps flashing.