Guides

N99 respirators filter at least 99% of airborne particles — four percentage points higher than the N95 standard. That gap sounds small until you run the math: an N95 allows up to 5% penetration; an N99 allows only 1%. In high-hazard environments where very fine particulates, beryllium dust, lead…

N99 and N100 disposable respirators are the highest-filtration class of disposable particulate respirators available under the NIOSH classification system. An N99 filters at least 99.0% of airborne particles ≥0.3 microns; an N100 filters at least 99.97% — effectively equivalent to a HEPA filter.…