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P99

noun — 2 senses

P99

noun

Etymology From Initialism of oil-Proof with 99% filtration efficiency in NIOSH air filtration ratings.

› P99; Ellipsis of NIOSH P99.

1

P99 standard

2

P99 filter

Related terms
N99, R99
Coordinate terms
R100, P100, N100 (99.97% filtration)

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.