The Newport 9000 HEPA/carbon filter replacement goes above and beyond where other models leave off. This true filter offers the purest home air filtration available. The twin-pack factory filter replacements for the Advanced Pure Air Newport 9000 Multi-Technology Air Purifier remove 99.97% of particles down to 0.3 microns in size, almost 300 times smaller than the width of a human hair. True air filters are recommended by the U.S. Dept. of Homeland Security. Activated carbon filters trap odors and chemicals in highly absorbent granules, protect against the harmful vapors from flooring and common home materials. By far the most effective filters against cigarette , this product is also very effective against everything from fumes to toilet and pet odors. Keep your Newport 9000 running like new for years by adding a new HEPA/carbon replacement filter every 3 to 4 months.