R99

Translingual Etymology mul en R99 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) and is somewhat resistant to oil. A en filter implementing the R99 standard. Coordinate terms mul P1, mul P2, mul P3 mul FFP1, mul FFP2, mul FFP3 Related terms mul R95, mul P95, mul N95 mul P99, mul N99 mul R100, mul P100, mul N100 English Etymology From en Resistant to oil particles with 99% filtration efficiency in en NIOSH air filtration ratings. Noun ~ mul R99; en NIOSH R99. en uncountable R99 standard en countable R99 filter Coordinate terms en R100, en P100, en N100 99.97% filtration Related terms en N99 non-oil-resistant filter standard en P99 oil-proof filter standard