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Inter-Laboratory Validation of the Method to Determine the Filtration Efficiency for Airborne Particles in the 3–500 nm Range and Results Sensitivity Analysis

Category: Special Issue for the 12th World Filtration Congress

Volume: 17 | Issue: 11 | Pages: 2669-2680
DOI: 10.4209/aaqr.2017.03.0104
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Panagiota Sachinidou1,2, Yeon Kyoung Bahk1,2, Min Tang3, Ningning Zhang3, Shawn S.C. Chen3, David Y.H. Pui3, Bruno Araújo Lima4, Gabriele Bosco4, Paolo Tronville4, Thomas Mosimann5, Mikael Eriksson6, Jing Wang 1,2

  • 1 Laboratory of Advanced Analytical Technologies, Empa, 8600 Dubendorf, Switzerland
  • 2 Institute of Environmental Engineering, ETH Zurich, 8093 Zurich, Switzerland
  • 3 Particle Technology Laboratory, Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55414, USA
  • 4 Department of Energy, Politecnico di Torino, 10129 Torino, Italy
  • 5 Unifil AG, Filtertechnik, CH-5702 Niederlenz, Switzerland
  • 6 Camfil Svenska AB, SE-619 33 TROSA, Sweden


Filtration tests for ISO standard.
< 20% deviation in filtration efficiency.
Ambient factors have marginal effects.


The filtration of airborne nanoparticles is becoming an important issue as they are produced in large quantities from material synthesis and combustion emission. Current international standards dealing with efficiency test for filters and filter media focus on measurement of the minimum efficiency at the most penetrating particle size. The available knowledge and instruments provide a solid base for development of test methods to determine the effectiveness of filtration media for airborne nanoparticles down to a single-digit nanometer range.

An inter-laboratory evaluation is performed under the Technical Committee 195 of European Committee for Standardization (CEN/TC195) for the development of the methodology to determine effectiveness of filtration media for airborne particles in the 3–500 nm range. Statistical analysis of the results was performed according to ISO 5725-2 in order to evaluate the test procedure and sensitivity analysis was carried out to identify the factors that could possibly affect the test results.

Inter-laboratory analysis revealed some deviation among the experimental results. The statistical analysis showed a less than 20% deviation. This deviation could be attributed to the difference among the experimental setups used by the laboratories. The sensitivity analyses did not indicate a strong influence by the temperature, relative humidity, flow distribution, challenging particle concentration, or particle density on the filtration efficiency in the parameter ranges used in the inter-laboratory test. However, the charging status of the filter affected the filtration efficiency.


Filtration efficiency Inter-laboratory tests Sensitivity analysis Statistical analysis

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