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HEPA filtration was developed by the Atomic Energy Commission during The Manhattan Project in World War II to remove radioactive particles from the air. By definition, a HEPA filter must remove at least 99.97% of all airborne particles down to a size of .3 microns which is one-300th the diameter of a human hair. It therefore approaches total efficiency on all known organisms harmful to man. Studies have proven that HEPA filters actually increase in efficiency with use over their 5 year life.
In hospital operating rooms, burn centers, laboratories and manufacturers of critical products like computer chips, where particle free air is mandatory, HEPA filtration systems are used to remove bacteria, molds and other airborne contaminants. If a filter cannot remove .3 micron germs or spores, it has very little if any benefits to health.
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