Eurovent 4/9: Method of testing air filters used in general ventilation for determination of fractional efficiency

Developments in the aerosol technology allow to have access to filter fractional efficiency. The Eurovent Working Group 4b has developed a new method of testing air filters used in general ventilation for determination of fractional efficiency, adapted for a better use of filters in industrial process and in the field of indoor air quality. This new method Eurovent 4/9 has replaced the old Eurovent 4/5 method. This is the English version of the Recommendation