N99

Translingual Etymology mul en N99 Noun mul noun A en filtration type that efficiently filters out 99% of airborne en particulate particulates of 0.3 en micron microns μm (and all larger particles), but which is not resistant to oils. By extension, filtration en standard of 99% of airborne particulates A en filter implementing the N99 standard. Coordinate terms mul P1, mul P2, mul P3 mul FFP1, mul FFP2, mul FFP3 Related terms mul R95, mul P95, mul N95 mul R99, mul P99 mul R100, mul P100, mul N100 English Etymology From en Not resistant to oil particles with 99% filtration efficiency in en NIOSH air filtration ratings. Noun ~ mul N99; en NIOSH N99. en uncountable N99 standard en countable N99 filter Coordinate terms en R99, en P99 99% filtration en R100, en P100, en N100 99.97% filtration Related terms en R95 oil-resistant filter standard en P95 oil-proof filter standard