The Best HEPA Air Purifiers 2020 | Air Purifier Ratings
HEPA is an acronym that stands for High Efficiency Particulate Air. This is a pleated filter that traps airborne particles as they pass through an air purifier. A true HEPA filter removes 99.97% of all particles that are 0.3 microns in size or larger. This is known as the HEPA standard.