DESC: HEPA Filter/HEPA Filter Midsize - S300 - S600 - 07226160 The Active H E P A High-Efficiency Particulate Air filter not only captures and retains tiny lung-damaging particles including dust mite feces and pollen it also uses the same Generally Activated Charcoal filter GAC that the Active Air Clean filter uses to absorb odors This Miele filter conforms to the new stringent European standard for filtration EN 1822 which means that it actually traps 99 99% of all particles as tiny as 0 3 of a micron This model is for the S300 - S600 Series