- 2-Pack of H13 True HEPA+ Activated Carbon 2-IN-1 Filters designed for optimal air purification performance. - Compatible with Blueair Blue Pure 411 Air Purifier (Replaces Part Number SF411PACF102174/100929). - H13 True HEPA filtration captures up to 99.97% of airborne particles as small as 0.3 microns. Effectively eliminates dust, pollen, pet dander, smoke, and other tiny pollutants. - Activated carbon technology neutralizes harmful chemicals such as VOCs, tobacco smoke, PM2.5, and common household odors, ensuring fresher indoor air quality. - Regular filter replacement is essential for maintaining air quality. We recommend checking your filter monthly. Cleaning with a soft brush or gentle vacuum helps sustain its effectiveness. - Ideal for households with pets, allergy sufferers, and anyone looking to enhance their indoor air quality. - Perfect for use in bedrooms, living rooms, or office spaces where air purity is important for health and comfort.