The Air Journal is OxiClear's magazine on air, breathing and the craft of masks. Issue one, remastered.
N95. N99. KN95. FFP2. Four labels, one trick to reading them all. Five minutes from now, nobody sells to you blind again.
Eight forty in the evening, at a red light with a hundred engines idling around you. Exhaust curls up into the brake-lamp glow. You pull your mask up before the light turns. Four characters are printed on the box it came in. Could you say what they mean? Most of us never could. That changes tonight.
The number is a floor
The letters come from NIOSH, the United States agency that certifies workplace respirators. Its rulebook is a standard called 42 CFR Part 84, and it is refreshingly blunt. Machines fire a salt aerosol at the mask material and count what gets through. Stop at least 95 percent and the filter earns N95 class. Stop 99, N99. No adjectives. A number, and a floor under it.
The test particles measure about 0.3 microns, and that is on purpose. Bigger particles are easy to catch. Smaller ones drift into the fibres on their own. Near 0.3 microns sits the hardest size any filter will ever face, so the exam happens there. Pass at the hardest size and the easier sizes come along free.
On paper, 95 and 99 sit four points apart. At the filter, they do not. Out of every 100 of the hardest particles, an N95-class filter may let through as many as five. An N99-class filter, one. Same commute, same red light, five times fewer getting past the door.
Same idea, different flags
KN95 is China's rating, under a standard called GB2626. FFP2 is Europe's, under EN 149. Both sit near the N95 line. Read every label the same way: the letters name the rulebook, the number names the floor.
The label is a claim. Make it show its work.
What the certificate says. What it does not.
Here is the part most brands mumble through. We would rather be straight with you. NIOSH certification belongs to masks submitted to NIOSH and approved in the United States. OxiClear masks are not NIOSH certified, and we have never claimed to be. We use N99 as our performance designation, and we back it with a test you can actually read.
We let a defence laboratory do the talking. OxiClear masks are DRDO Laboratory Tested: up to 99.46% particle filtration efficiency for particles larger than 0.3 microns under test conditions. The full report, the conditions and our registration live on the Technical page. In full. Not in a footnote.
The other half of the mask
A filter can only clean the air that actually passes through it. Air is lazy. It takes the easiest door, and if the easiest door is a gap beside your nose, the rating on the box stops mattering.
That is why fit gets equal billing in every OxiClear design: a shaped nose pin, a foam edge that settles over the bridge of your nose, ear loops that adjust evenly, a detachable headband for long days. Ten seconds of adjustment beats four decimal places of filtration. The whole routine takes a minute, and it lives in our fit guide.
Built to be thrown away. Or not.
Most rated masks are disposable by design: wear, bin, buy again. We took the other road in 2016 and never looked back. A washable cotton body with embroidered branding. An activated carbon filter that slides into the pocket inside. Made in our own factory. Wash the body, swap the filter, keep the mask. Replace the filter every 21 days or 100 hours of use, whichever comes first. Refills come in packs of 10 and 20.
Take this with you
The ten-second label check, any mask, any brand:
- Find the rating. The number is the floor: 95 stops at least 95 in 100, 99 stops at least 99.
- Ask who tested it. A rating without a readable test behind it is just typography.
- Check the fit hardware. Nose pin, edge seal, adjustable straps: they decide whether the rating ever reaches your lungs.
- Ask about week four. Disposable means bin it and buy again. Reusable means wash the body, swap the filter.
That is the whole game.
Read the air itself in issue two, browse the OxiClear N99 range, or start where we would: with the test, on the Technical page.
Sources: the NIOSH particulate respirator standard, 42 CFR Part 84; the OxiClear DRDO test report on the Technical page.
