What Is A HEPA Air Purifier?
HEPA stands for High Efficiency Particulate Arrestance. Some industry members mislabel the letter ‘A’ meaning Air. To be classified as HEPA the filter media has to meet a minimum of 99.97% efficiency ( particle collection or particle stopping power ) of any particle that has mass of 0.3 microns or larger. So in other words, to be called HEPA you need a filter that is capable of stopping airborne particles that are the same size or larger than 0.3 microns 99.97% of the time. If this were to be measured, then there should be an airborne reduction of airborne particles that are 0.3 microns in size to 99.97% lower than before the HEPA filter was used. A micron is one 1 millionth of a meter. A human hair is usually 75 microns. The issue with most HEPA filters is not the HEPA filter media as very few HEPA air filter or HEPA air purifier manufactures actually make or manufacturer their own filter media. Most buy the HEPA media from a HEPA media manufacturer that has tight controls on th...