PMC:7784787 / 3228-4380 JSONTXT

{"target":"https://pubannotation.org/docs/sourcedb/PMC/sourceid/7784787","sourcedb":"PMC","sourceid":"7784787","source_url":"https://www.ncbi.nlm.nih.gov/pmc/7784787","text":"Face masks worn in a pandemic function more effectively as source control rather than protection [17]. Particles can escape from the mask in two ways- either direct penetration of the fabric, or leakage around the sides [18]. While inward leakage testing is part of the requirements for personal protective equipment (PPE) masks in European Standard (EN) 149, the standard for medical masks, EN 14683, does not have any requirement for a leakage test – neither inward nor outward. The European Committee for Standardisation Workshop Agreement (CWA) 17553 for face coverings also has no quantitative fit test. In fact, to our knowledge, a standard test for outward leakage does not exist. When both leakage and fabric penetration are considered for workplace usage of PPE, the result is the assigned protection factor. These values typically show far lower protection than would be assumed from the performance of the fabric alone. We propose a new metric to take into account outward leakage, which we call outward suppression factor. One would expect outward leakage to be more challenging to fix as the exhaling pressure potentially reduces the seal.","tracks":[{"project":"LitCovid-sentences","denotations":[{"id":"T30","span":{"begin":0,"end":102},"obj":"Sentence"},{"id":"T31","span":{"begin":103,"end":225},"obj":"Sentence"},{"id":"T32","span":{"begin":226,"end":480},"obj":"Sentence"},{"id":"T33","span":{"begin":481,"end":608},"obj":"Sentence"},{"id":"T34","span":{"begin":609,"end":687},"obj":"Sentence"},{"id":"T35","span":{"begin":688,"end":817},"obj":"Sentence"},{"id":"T36","span":{"begin":818,"end":930},"obj":"Sentence"},{"id":"T37","span":{"begin":931,"end":1034},"obj":"Sentence"},{"id":"T38","span":{"begin":1035,"end":1152},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"attributes":[{"subj":"T30","pred":"source","obj":"LitCovid-sentences"},{"subj":"T31","pred":"source","obj":"LitCovid-sentences"},{"subj":"T32","pred":"source","obj":"LitCovid-sentences"},{"subj":"T33","pred":"source","obj":"LitCovid-sentences"},{"subj":"T34","pred":"source","obj":"LitCovid-sentences"},{"subj":"T35","pred":"source","obj":"LitCovid-sentences"},{"subj":"T36","pred":"source","obj":"LitCovid-sentences"},{"subj":"T37","pred":"source","obj":"LitCovid-sentences"},{"subj":"T38","pred":"source","obj":"LitCovid-sentences"}]}],"config":{"attribute types":[{"pred":"source","value type":"selection","values":[{"id":"LitCovid-sentences","color":"#93eca6","default":true}]}]}}