| PARTICULATE CONTAMINANTS: FILTERS | ||
High-Efficiency Particulate Air (HEPA) filters were originally developed during World War II to prevent radioactive particles from escaping nuclear reactor facility exhausts. To qualify as a "true" HEPA, they must not allow more than 3 particles out of 10,000 to penetrate the filter. With a particle removal efficiency of 99.97% at the 0.3 micron diameter level (about 300 times smaller than a single strand of hair), they play a vital role in medical, industrial and military cleanrooms. |
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