English Explanatory Dictionary

R99

English dictionary entry

Meanings

noun
  1. R99; Ellipsis of NIOSH R99.
  2. R99 standard
  3. R99 filter

Word forms

R99 R99s

Etymology

From Initialism of Resistant to oil particles with 99% filtration efficiency in NIOSH air filtration ratings.

Related words

N99 P99
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