This replacement filter combo pack is the perfect addition to your AirDoctor 3000 or AirDoctor 3500 air purifier. With one Ultra HEPA filter and two VOC filters, you can trust that this pack will keep your indoor air quality at its best. The filtration technology used is True HEPA, ensuring that even the smallest particles are captured and removed from the air. The pack contains three filters, each with a filter life of 12 months, making it easy to keep your air purifier running smoothly for an extended period. Its flat panel design and black color make it a sleek and stylish addition to your home. Made in China, this unit is compatible with AirDoctor 3000 and AirDoctor 3500.