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This European Standard specifies the minimum requirements for filtering half masks used as respiratory protective devices, especially against particles, and the necessary laboratory and practical performance tests to assess the conformity of the masks. Half masks that are used for escape purposes are excluded from the scope of this standard.
Under the previous certified EN149: 1991 the classifications were FFP1S, FFP2S, FFP2SL, FFP3S and FFP3SL. In the EN149: 2001 standard, half masks were divided into three types according to their filter performance (e.g. FFP1, FFP2 and FFP3). Respirators that meet the requirements of EN149: 2001 are designed to provide protection against solids, water-based aerosols, and oil-based aerosols.
The certified EN149: 1991 differs from EN149: 1991 in that all products tested according to EN149: 2001 must offer protection against solid and liquid aerosols, while EN149: 1991 only allows the testing of respiratory masks against solid aerosols. On August 1st, 2010 an amendment to the standard EN 149.2001 came into force, which refers to the reusability of the dust filters of masks which are marked with “R”, reusable, and “NR”, not reusable, and as certified EN 149 : 2001 + A1: 2009 are marked.
EN 149 defines the following classes of filtering half masks (i.e. respiratory protection masks that consist entirely or essentially of filtering material): Class APF (Assigned Protection Factor) limit value for filter penetration (at 95 L / min air flow rate) internal leakage. An FFP3 respirator would filter out at least 98% of the respirable particles in the air, while an FFP1 respirator would filter out at least 80% of the respirable particles. FFP3 respirators are therefore most efficient at filtering out fine particles such as viruses, mold spores and asbestos. Respirators that meet the requirements of the certified standard EN149: 2001 are designed to repel solids, water-based aerosols and oil-based aerosols and are resistant to dust, fog or fibers.
