Development of a methodology of determining fractional filtration efficiency of filtering materials and air filters used in collective protective equipment protecting against airborne particles
Elżbieta Jankowska Ph.D. (Eng.)
This research task consisted of a survey and an analysis of the methods of measurements and the principles of classification of primary panel (G1-G4 class), fine (F5-F9 class) and high-efficiency (H10-H14 and U15-U17 class) air filters in accordance with Polish and European standards. The efficiency of filtering materials and air filters were tested depending on their structural properties, air-flow parameters and the properties of test aerosols. The dependence of the efficiency of filtration and penetration of various classes of filtration materials and air filters on the size of the atmospheric aerosol and the air flow rate was studied.An analysis of standardized test methods and the results of the tests was a basis for the development of a methodology of determining fractional filtration efficiency of filtering materials and air filters with the use of an optical particle counter (OP) and a condensation particle counter (CPC).Correlation between the results of tests of the fractional filtration efficiency and penetration obtained with the use of various kinds of counters was determined. Procedures of determining fractional filtration efficiency of filtering materials and air filters with the use of optical and condensation particle counters were developed.
Department of Chemical and Aerosol Hazards