EN ISO 23328-1:2008

Foreword
Introduction
1 Scope
2 Terms and definitions
3 Method
  3.1 Principle
  3.2 Test conditions
  3.3 Apparatus
  3.4 Conditioning of BSF
  3.5 Sample size
  3.6 Procedure
4 Calculation and expression of test results
5 Test report
Annex A (normative) - Conditioning of BSF
Annex B (informative) - Aerosol particle size distribution
Annex C (informative) - Rationale for chosen test method
Annex D (informative) - Clauses of this part of ISO 23328
                        addressing the essential principles
                        of ISO/TR
Annex ZA (informative) - Relationship between this European
                         Standard and the Essential
                         Requirements of EU Directive
                         93/42/EEC Medical devices
Bibliography

ISO 23328-1:2003 gives a short-term airborne sodium chloride particle challenge test method for assessing the filtration performance of breathing system filters (BSF) intended for the filtration of respired gases. ISO 23328-1:2003 is applicable to BSF used with a clinical breathing system. It is not applicable to other types of filter, e.g. those designed to protect vacuum sources or gas sample lines, to filter compressed gases, or to protect test equipment for physiological respiratory measurements.Non-filtration aspects of BSF are addressed in ISO 23328-2.