HEPA stands for high-efficiency particulate air, and a HEPA filter is a specially designed air filter that excels at capturing tiny particles in the air. These filters are constructed from a dense network of glass fibers that form a labyrinth-like structure, which traps particles as air passes through. To qualify as a true HEPA filter, it must ... More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.