English Explanatory Dictionary

N99

English dictionary entry

Meanings

noun
  1. N99; Ellipsis of NIOSH N99.
  2. N99 standard
  3. N99 filter

Word forms

N99 N99s

Etymology

From Initialism of Not resistant to oil particles with 99% filtration efficiency in NIOSH air filtration ratings.

Related words

R95 P95
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