NEA-F1 H13 True HEPA filter captures up to 99.97% of particles as small as 0.1 micrometre in size from your indoor air such as pollen, allergen, lint, household dust, pets dander, smoke and smog. NEA-C1 activated carbon pre-filter helps trap large airborne particles to prolong the life or the HEPA filter, and helps redue unwanted odors from pets, cooking, smoking, wildfire, and harmful VOC's. Fully compatible with for NEA120 air purifier and Smart WiFi Air Purifier CAF-W36USW.True HEPA filter is essential for households with Children, Seniors, Pets, Allergy, smokers and Asthma sufferers. This high-efficiency two-stage True HEPA filtration is perfect for those with frequent or recurring allergies as it effectively with most pollen, mold spores, household dust, pet dander and smoke, so the air you breathe is free from irritants. Easy to replace and disposable, no tools required. Replace the real HEPA filter every 12 months and the activated carbon filter every 3 months to get the best performance.