These three get used interchangeably in casual conversation and they shouldn’t be. An N95 is a respirator: it seals to your face and filters at least 95% of airborne particles, and it protects the person wearing it. That seal is the whole point — without a fit, the rating means nothing.
A surgical or procedure mask is a barrier device. It protects other people from you and gives you splash resistance, but it doesn’t seal, so it doesn’t deliver respirator-level protection to the wearer. Different job, different rating (ASTM Level 1, 2, or 3 by fluid resistance).
KN95 is where the confusion and the mis-ordering live. It’s a Chinese standard, roughly comparable to N95 on paper, but it carries no U.S. workplace approval and the market flooded with mislabeled, untested boxes in 2020. “Meets N95 standards” printed on a box is marketing, not a NIOSH approval number.
Before your unit commits to a pallet, check the actual markings: a real N95 has a NIOSH TC number on the respirator itself. Match the device to the task — respirator for aerosol exposure, surgical mask for barrier and splash — and you’ll stop paying for protection you’re not actually getting.
For the full breakdown, read our infection prevention guidelines — it goes deeper than we can here.