NEN EN 1822-1 : 2009

Foreword
1 Scope
2 Normative references
3 Definitions, symbols and abbreviations
    3.1 Definitions
    3.2 Symbols and abbreviations
4 Classification
    4.1 Groups of filters
    4.2 Classes of filters
5 Requirements
    5.1 General
    5.2 Material
    5.3 Nominal air volume flow rate
    5.4 Pressure difference
    5.5 Filtration performance
6 Test methods
    6.1 Test rigs
    6.2 Test conditions
    6.3 Test aerosols
    6.4 Survey of test procedures
    6.5 Test procedures
7 Assessment of the filter, documentation
8 Marking

Defines a procedure for the determination of the efficiency on the basis of a particle counting method using a liquid (or alternatively a solid) test aerosol, and allows a standardized classification of these filters in terms of their efficiency, both local and integral efficiency. Applies to high efficiency particulate and ultra low penetration air filters (EPA, HEPA and ULPA) used in the field of ventilation and air conditioning and for technical processes, e.g. for applications in clean room technology or pharmaceutical industry.