Hepa Filter Particle Size. Hepa filters are ideal for very small particles measured in micrometers or microns and are represented by the symbol µm. Hepa is a type of pleated mechanical air filter.
To put particle size into perspective a human hair ranges in size from 17 181 microns in diameter most allergy causing pollen is 10 40 microns duct particles can be as small as 2 5 10 microns bacteria are generally in the range of 0 3 5 microns and viruses the smallest particles range in size from 0 004 0 1 microns. By definition a high efficiency particulate air hepa filter is at least 99 97 efficient at capturing particles 0 3 µm in size. However this is a proven and accepted fact in the filtration sciences.
This type of air filter can theoretically remove at least 99 97 of dust pollen mold bacteria and any airborne particles with a size of 0 3 microns µm.
It falls squarely within the particle size range that hepa filters capture with extraordinary efficiency. This type of air filter can theoretically remove at least 99 97 of dust pollen mold bacteria and any airborne particles with a size of 0 3 microns µm. However this is a proven and accepted fact in the filtration sciences. It is an acronym for high efficiency particulate air filter as officially defined by the u s.
