EN 149 is a European<unk> of testing and marking requirements for filtering half masks. Such masks cover the nose, mouth and chin and may have inhalation and/or exhalation valves. EN 149 defines three classes of such particle half masks, called<unk> 1,<unk> 2 and<unk> 3, (where<unk>  stands for filtering facepiece) according to their filtering efficiency. It also classifies masks into "single shift use only" (not re-usable, marked NR) or "re-usable (more than one shift)" (marked R), and an additional marking letter D indicates that a mask has passed an optional clogging test using dolomite dust. Such mechanical filter respirators protect against the inhalation of particulates such as dust particles, droplets, and aerosols. Almost identical tests (but different markings) are used in Australia, New Zealand, Korea and Brazil. Similar<unk>  are used in the United States, China and Japan. For example, EN 149<unk> 2 masks have similar performance requirements to N95 masks in the United States and KN95 filters of China, and EN 149<unk> 3 masks have similar performance requirements to N99 masks in the United States. However EN 149 test requirements differ somewhat from the U.S./Chinese/Japanese<unk> : EN 149 requires an additional paraffin oil (paraffinum perliquidum) aerosol test and it tests at a range of different flow rates and defines several associated and permissible pressure drop levels.
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