N99

noun — 2 senses

noun

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

› N99; Ellipsis of NIOSH N99.

N99 standard

N99 filter

Related terms: R95, P95
Coordinate terms: R99, P99 (99% filtration), R100, P100, N100 (99.97% filtration)

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