HEPA filters are classified according to the level of filtration capacity and are generally classified into G1 to H14 and other grades. For fine particles with a diameter of 0.3 microns or more, G1-F5 does not have any filtering effect, and the filtration efficiency of F6-H14 is from 20% to 99.999997%. F6-F8 is called medium efficiency air filter; To answer this question, we need to first answer if HEPA filters can capture particles as small as viruses, such as the coronavirus. The COVID-19 coronavirus measures 0.06 – 0.14 microns in diameter. HEPA filters – the workhorse of any purifier – must remove 99.97% of particles “greater than or equal to” 0.3 microns. This air purifier uses a 3-stage filtration technology consisting of a pre-filter, a NanoProtect HEPA filter, and an activated carbon filter. The Philips Series 800 improved air quality by approximately 93% in a performance test in a 194 sq. ft. room, which is a fantastic result. Philips provides a 2-year warranty on this model. This device is suitable for extra-large rooms that are up to 465 square feet (sq. ft). The company states that the HEPA filter can remove up to 99.97% of airborne particles. BETTER THAN HEPA – Pre-filter, True H13 HEPA filter combined with patented NCCO technology (Nano Confined Catalytic Oxidation) sanitizes your house and kills and removes harmful pollutants. It breaks down the harmful particles in the air into harmless compounds and is more effective than a charcoal filter. Dehumidifiers will have a standard filter, but other filters such as HEPA and activated carbon may come included or be available as optional extras. Our own dehumidifier comes with a nano-silver coated filter as standard, but we also bought HEPA and activated carbon filters to go with it as optional extras. A depth filter, glass microfiber is made from 100% borosilicate glass, highly inert, and often used as a prefilter. It’s resistant to temperatures up to 500°C and a very wide range of solvents. When should I use it? DO USE: with most of common solvents, including aqueous and organic, strong acids and bases. ULPA filters trap more and smaller particulate matter than HEPA filters. ULPA filters are 99.999% effective at removing submicron particulate matter of 0.12-micron diameter or larger, while HEPA filters are 99.97% effective for eliminating particulate matter of 0.3-micron diameter or larger. HEPA filters can be combined with pre filters to trap 6oS6tX.