high-efficiency particulate air (HEPA) filters

high-ef·fi·cien·cy par·tic·u·late air (HEPA) fil·ters

(hī ĕ-fishĕn-sē pahr-tikyū-lăt ār filtĕrz)
A type used in health care settings that removes all but the very smallest potential irritants from recirculating air.
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