How long have HEPA filters been in use?

The first HEPA filters were developed for the Atomic Energy Commission during World War II for
use in facilities manufacturing components for the Manhattan (atomic bomb) project. These HEPA
filters were originally designed to capture microscopic radioactive particles too small for effective
removal by existing types of filters. HEPA filters used today are much more efficient and
economical than the products made in the 1940’s.

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