NEN EN 1822-2 : 2009

Foreword
1 Scope
2 Normative references
3 Definitions
4 Aerosol production
4.1 Aerosol substances
4.2 Producing monodisperse aerosols
4.3 Generating polydisperse aerosols
4.4 The neutralization of aerosols
4.5 Minimum performance parameters for
      aerosol generators
4.6 Sources of error
4.7 Maintenance and inspection
5 Measuring devices
5.1 Optical particle counters
5.2 Condensation nucleus counter
5.3 Differential mobility analyser
5.4 Particle size analysis system on the
      basis of differential mobility analysis
5.5 Dilution systems
5.6 Differential pressure measuring equipment
5.7 Absolute pressure measuring equipment
5.8 Thermometers
5.9 Hygrometer
6 Maintenance and inspection intervals
7 Particle counting statistics
Annex A (informative) Bibliography

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 efficient particulate air filters (EPA), high efficiency particulate air filters (HEPA) and ultra low penetration air filters (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.