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Performance of Electret Filters for Use in a Heating, Ventilation and Air Conditioning System and an Automotive Cabin against Combustion and NaCl Particles

Category: Control Techniques and Strategy

Volume: 16 | Issue: 6 | Pages: 1523-1531
DOI: 10.4209/aaqr.2015.09.0565
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Jin-Yong Kim1, Shuang Gao1, Michael Yermakov1, Yousef Elmashae1, Xinjian He2, Tiina Reponen1, Sergey A. Grinshpun 1

  • 1 Center for Health-Related Aerosol Studies, Department of Environmental Health, University of Cincinnati, Cincinnati, Ohio, USA
  • 2 Department of Industrial and Management Systems Engineering, Statler College of Engineering and Mineral Resources, WV University, Morgantown, West Virginia, USA


An HVAC filter and an ACA filter were challenged with combustion and NaCl particles.
Collection efficiency of each filter challenged with two aerosols was determined.
Filtration of NaCl particles is more efficient than that of combustion particles.


This study was conducted to investigate the performance of a high-efficiency Heating, Ventilation and Air Conditioning (HVAC) filter and a top-of-the line Automotive Cabin Air (ACA) filter challenged with particles generated by the combustion of paper, wood, and plastic as well as with NaCl particles. The collection of submicron particles was examined under conditions representing two typical indoor air flow rates for the HVAC filter and two cabin fan control levels for the ACA filter. For the HVAC filter, almost all the collection efficiency values exceeded 80%; for the ACA filter, the collect efficiencies were much lower (< 40%) for all the tested aerosols and flow rates. Both filters demonstrated lower collection efficiency for combustion aerosols as compared to NaCl. This finding was consistent for all tested particle sizes and flow rates. The difference was always statistically significant in terms of the total efficiency (combining all sizes); however, the size-specific analysis of the differences revealed that the significance level varied with the particle size and flow rate. When tested under their operational flow conditions, the HVAC filter showed significantly better performance than the ACA filter. It was concluded that the filter performance characteristics of the HVAC and ACA filters obtained using well-established salt aerosol challenges may not accurately predict the performance of these filters against combustion aerosol particles. The difference was attributed to the interactions between the particles and filter fibers.


HVAC filter Automotive cabin air filter Combustion aerosols NaCl Collection efficiency

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