The EN 149 standard covers particle filtering half masks, commonly called disposable dust masks, and sets out requirements for materials, field of vision, performance, markings and user information. The respirator must be tested both on laboratory equipment and on real people performing work simulation tests in a laboratory environment. Testing covers breathing resistance, penetration, clogging, and carbon dioxide of the air, as well as strength of connections and valves.

Masks are divided into three classes:

• FFP1 – Low filter performance (80% efficiency),
• FFP2 – Medium filter performance (94% efficiency),
• FFP3 – High filter performance (99% efficiency)