Allergy Plus True HEPA filtration removes up to 99.99% of airborne allergensSuper Quiet to Super Clean settings are customized to fit your schedule and your lifestyleDual position operation to fit in any roomChoose from five cleaning speeds to keep the air fresh and pure inside your homeOptional ionizer assists in particle removal; negative ions bind with airborne dust and pollen to form larger particles that are more easily captured by the filterWashable pre-filter captures larger particles to extend the cleaning cycle of the filter12 hour timer for worry free operationFilter service indicator eliminates guesswork when filter cleaning is neededRecommended for large rooms up to 204 sq. feetCompatible with all aer1® ready air purifiers