An activated carbon filter helps reduce odors and Features a filter-life indicator that tells you when the filter needs to be changed. Comes with micro ban antibacterial product protection. Certified by AHAM. HAPF600 holmes filter replacement set contains 3 True HEPA filter helps you absorb 99.7% of the suspended with a size of 0.3 microns effectively the 3 included carbon filter s thick fits perfectly into the holding tabs on this “B” style HEPA filter. Combined use provide you higher filtration efficiency longer use time reduce unwanted odors in your living spaces increased air quality enhances your indoor environment especially during this period of work at home.