Filtrete Air Cleaning Filter 15 " X 9 " X 0.75 " Hepa Replacement Filter For The FAP01-RS, Small Room Air Purifier & FAP02-RS, Medium Room Air Purifier. Advanced Filtrete Filtration Technology Effectively Captures 99.9% Of Airborne Particles & Allergens Filter Change Indicator Senses The Particle Accumulation On The Filter, Taking The Guesswork Out Of Filter Change No Ozone Generation Made in USA