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• W3202327157 endingPage "e0258191" @default.
• W3202327157 startingPage "e0258191" @default.
• W3202327157 abstract "Face coverings are a key component of preventive health measure strategies to mitigate the spread of respiratory illnesses. In this study five groups of masks were investigated that are of particular relevance to the SARS-CoV-2 pandemic: re-usable, fabric two-layer and multi-layer masks, disposable procedure/surgical masks, KN95 and N95 filtering facepiece respirators. Experimental work focussed on the particle penetration through mask materials as a function of particle diameter, and the total inward leakage protection performance of the mask system. Geometric mean fabric protection factors varied from 1.78 to 144.5 for the fabric two-layer and KN95 materials, corresponding to overall filtration efficiencies of 43.8% and 99.3% using a flow rate of 17 L/min, equivalent to a breathing expiration rate for a person in a sedentary or standing position conversing with another individual. Geometric mean total inward leakage protection factors for the 2-layer, multi-layer and procedure masks were <2.3, while 6.2 was achieved for the KN95 masks. The highest values were measured for the N95 group at 165.7. Mask performance is dominated by face seal leakage. Despite the additional filtering layers added to cloth masks, and the higher filtration efficiency of the materials used in disposable procedure and KN95 masks, the total inward leakage protection factor was only marginally improved. N95 FFRs were the only mask group investigated that provided not only high filtration efficiency but high total inward leakage protection, and remain the best option to protect individuals from exposure to aerosol in high risk settings. The Mask Quality Factor and total inward leakage performance are very useful to determine the best options for masking. However, it is highly recommended that testing is undertaken on prospective products, or guidance is sought from impartial authorities, to confirm they meet any implied standards." @default.
• W3202327157 created "2021-10-11" @default.
• W3202327157 creator A5012260394 @default.
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• W3202327157 date "2021-10-06" @default.
• W3202327157 modified "2023-10-12" @default.
• W3202327157 title "The protective performance of reusable cloth face masks, disposable procedure masks, KN95 masks and N95 respirators: Filtration and total inward leakage" @default.
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• W3202327157 doi "https://doi.org/10.1371/journal.pone.0258191" @default.
• W3202327157 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/8494377" @default.
• W3202327157 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/34614026" @default.
• W3202327157 hasPublicationYear "2021" @default.
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