FFP3 NR D is a marking commonly found on European-standard filtering facepiece respirators under EN 149:2001+A1:2009.
* FFP3 — Highest filtering class under EN 149, with at least 99% filtration efficiency and maximum 2% inward leakage under the standard’s test conditions.
* NR — Non-Reusable; intended for use for a single work shift.
* D — Passed the Dolomite dust clogging test, indicating better resistance to clogging and breathing resistance under heavy dust loading.