NEN EN 1822-5 : 2009

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
      3.1 sampling volume flow rate
      3.2 sampling duration
      3.3 measuring procedure with fixed sampling
             probes
      3.4 total particle count method
      3.5 particle counting and sizing method
4 Description of the method
      4.1 Measurement method using fixed sampling probe
      4.2 Scan method
5 Test filter
6 Test apparatus
      6.1 Test duct
      6.2 Aerosol generation and measurement instruments
7 Test air
8 Test procedure
      8.1 Preparatory checks
      8.2 Starting up the aerosol generator
      8.3 Preparing the test filter
      8.4 Testing
9 Evaluation
10 Test report
11 Maintenance and inspection of the test apparatus

Defines a procedure for the determination of the efficiency on the basis of a particle counting method using a liquid test aerosol, and allows a standardized classification of these filters in terms of their 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.