Frequently Asked Questions
Q: What does FFP3 NR D mean?
A: FFP3 is the highest class of disposable dust mask under EN 149, filtering at least 99% of airborne particles. NR means non-reusable, so the mask is for a single shift. D means it passed the dolomite clogging test, so it stays easier to breathe through in heavy dust.
Q: Will a one size FFP3 mask fit me?
A: It fits many face shapes, but the only way to know is a face fit test. UK law requires each wearer of a tight-fitting respirator to pass one for the exact model they use.
Q: What does an assigned protection factor of 20 mean?
A: It means a correctly fitted FFP3 mask can be expected to reduce the dust you breathe in to a twentieth of the level in the air. HSE uses it, in HSG53, to check whether a mask gives enough protection for the dust levels on the job.
Q: What are these masks not suitable for?
A: They filter particles only, so they don’t protect against gases, vapours or solvent fumes. They’re also not for oxygen-deficient air, confined spaces, licensed asbestos removal or wearers with facial hair.
Q: Should I choose a valved or unvalved FFP3 mask?
A: Both filter the air you breathe in to the same standard. A valved mask is cooler and fogs glasses less, which suits heavy work, hot conditions and long shifts. An unvalved mask is better where exhaled breath must also be filtered.
Q: Can I wear safety glasses with this mask?
A: Yes. The valve lets warm, moist air out, which helps reduce fogging. Fit the mask first, then the glasses, and check the glasses don’t push the mask out of place.
Q: How long does an FFP3 NR mask last?
A: One shift, up to 8 hours. Replace it sooner if it becomes damaged, wet, dirty or harder to breathe through.
Q: Do I need to be clean-shaven to wear an FFP3 mask?
A: Yes. Beards and stubble stop the mask sealing against the skin, so dust leaks in around the edges. Wearers with facial hair need a loose-fitting powered hood instead.