CovidStanfordV1, Main, Exploration, bibRecord, 000835

A scalable method of applying heat and humidity for decontamination of N95 respirators during the COVID-19 crisis.

Identifieur interne : 000835 ( Main/Exploration ); précédent : 000834; suivant : 000836

A scalable method of applying heat and humidity for decontamination of N95 respirators during the COVID-19 crisis.

Auteurs : Loïc Anderegg [États-Unis] ; Cole Meisenhelder [États-Unis] ; Chiu Oan Ngooi [États-Unis] ; Lei Liao [États-Unis] ; Wang Xiao [États-Unis] ; Steven Chu [États-Unis] ; Yi Cui [États-Unis] ; John M. Doyle [États-Unis]

Source :

PloS one [ 1932-6203 ] ; 2020.

RBID : pubmed:32609741

Descripteurs français

KwdFr :
- Betacoronavirus (MeSH), Chauffage (méthodes), Décontamination (méthodes), Exposition professionnelle (prévention et contrôle), Filtration (instrumentation), Humains (MeSH), Humidité (MeSH), Infections à coronavirus (virologie), Infections à coronavirus (épidémiologie), Masques (virologie), Pandémies (MeSH), Pneumopathie virale (virologie), Pneumopathie virale (épidémiologie), Respirateurs purificateurs d'air (virologie), Réutilisation de matériel (MeSH), Test de matériaux (méthodes).
MESH :
- méthodes : Chauffage, Décontamination, Test de matériaux.
- prévention et contrôle : Exposition professionnelle.
- virologie : Infections à coronavirus, Masques, Pneumopathie virale, Respirateurs purificateurs d'air.
- épidémiologie : Filtration, Infections à coronavirus, Pneumopathie virale.
- Betacoronavirus, Humains, Humidité, Pandémies, Réutilisation de matériel.

English descriptors

KwdEn :
- Betacoronavirus (MeSH), COVID-19 (MeSH), Coronavirus Infections (epidemiology), Coronavirus Infections (virology), Decontamination (methods), Equipment Reuse (MeSH), Filtration (instrumentation), Heating (methods), Humans (MeSH), Humidity (MeSH), Masks (virology), Materials Testing (methods), Occupational Exposure (prevention & control), Pandemics (MeSH), Pneumonia, Viral (epidemiology), Pneumonia, Viral (virology), Respiratory Protective Devices (virology), SARS-CoV-2 (MeSH).
MESH :
- epidemiology : Coronavirus Infections, Pneumonia, Viral.
- instrumentation : Filtration.
- methods : Decontamination, Heating, Materials Testing.
- prevention & control : Occupational Exposure.
- virology : Coronavirus Infections, Masks, Pneumonia, Viral, Respiratory Protective Devices.
- Betacoronavirus, COVID-19, Equipment Reuse, Humans, Humidity, Pandemics, SARS-CoV-2.

Abstract

A lack of N95 Filtering Facepiece Respirators (FFRs) during the COVID-19 crisis has placed healthcare workers at risk. It is important for any N95 reuse strategy to determine the effects that proposed protocols would have on the physical functioning of the mask, as well as the practical aspects of implementation. Here we propose and implement a method of heating N95 respirators with moisture (85°C, 60-85% humidity). We test both mask filtration efficiency and fit to validate this process. Our tests focus on the 3M 1860, 3M 1870, and 3M 8210 Plus N95 models. After five cycles of the heating procedure, all three respirators pass both quantitative fit testing (score of >100) and show no degradation of mask filtration efficiency. We also test the Chen Heng V9501 KN95 and HKYQ N95 finding no degradation of mask filtration efficiency, however even for unheated masks these scored <50 for every fit test. The heating method presented here is scalable from individual masks to over a thousand a day with a single industrial convection oven, making this method practical for local application inside health-care facilities.

DOI: 10.1371/journal.pone.0234851
PubMed: 32609741
PubMed Central: PMC7329057

Affiliations:

Links toward previous steps (curation, corpus...)

to stream Main, to step Corpus: 000551
to stream Main, to step Curation: 000551

Le document en format XML

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<term>Coronavirus Infections (virology)</term>
<term>Decontamination (methods)</term>
<term>Equipment Reuse (MeSH)</term>
<term>Filtration (instrumentation)</term>
<term>Heating (methods)</term>
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<term>Humidity (MeSH)</term>
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<term>Materials Testing (methods)</term>
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<term>Décontamination (méthodes)</term>
<term>Exposition professionnelle (prévention et contrôle)</term>
<term>Filtration (instrumentation)</term>
<term>Humains (MeSH)</term>
<term>Humidité (MeSH)</term>
<term>Infections à coronavirus (virologie)</term>
<term>Infections à coronavirus (épidémiologie)</term>
<term>Masques (virologie)</term>
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<term>Masques</term>
<term>Pneumopathie virale</term>
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<keywords scheme="MESH" qualifier="virology" xml:lang="en"><term>Coronavirus Infections</term>
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<front><div type="abstract" xml:lang="en">A lack of N95 Filtering Facepiece Respirators (FFRs) during the COVID-19 crisis has placed healthcare workers at risk. It is important for any N95 reuse strategy to determine the effects that proposed protocols would have on the physical functioning of the mask, as well as the practical aspects of implementation. Here we propose and implement a method of heating N95 respirators with moisture (85°C, 60-85% humidity). We test both mask filtration efficiency and fit to validate this process. Our tests focus on the 3M 1860, 3M 1870, and 3M 8210 Plus N95 models. After five cycles of the heating procedure, all three respirators pass both quantitative fit testing (score of >100) and show no degradation of mask filtration efficiency. We also test the Chen Heng V9501 KN95 and HKYQ N95 finding no degradation of mask filtration efficiency, however even for unheated masks these scored <50 for every fit test. The heating method presented here is scalable from individual masks to over a thousand a day with a single industrial convection oven, making this method practical for local application inside health-care facilities.</div>
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<Day>18</Day>
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<Abstract><AbstractText>A lack of N95 Filtering Facepiece Respirators (FFRs) during the COVID-19 crisis has placed healthcare workers at risk. It is important for any N95 reuse strategy to determine the effects that proposed protocols would have on the physical functioning of the mask, as well as the practical aspects of implementation. Here we propose and implement a method of heating N95 respirators with moisture (85°C, 60-85% humidity). We test both mask filtration efficiency and fit to validate this process. Our tests focus on the 3M 1860, 3M 1870, and 3M 8210 Plus N95 models. After five cycles of the heating procedure, all three respirators pass both quantitative fit testing (score of >100) and show no degradation of mask filtration efficiency. We also test the Chen Heng V9501 KN95 and HKYQ N95 finding no degradation of mask filtration efficiency, however even for unheated masks these scored <50 for every fit test. The heating method presented here is scalable from individual masks to over a thousand a day with a single industrial convection oven, making this method practical for local application inside health-care facilities.</AbstractText>
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<ForeName>Cole</ForeName>
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<AffiliationInfo><Affiliation>Department of Physics, Stanford University, Stanford, CA, United States of America.</Affiliation>
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<AffiliationInfo><Affiliation>Department of Molecular and Cellular Physiology, Stanford University, Stanford, CA, United States of America.</Affiliation>
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<AffiliationInfo><Affiliation>Department of Materials Science and Engineering, Stanford University, Stanford CA, United States of America.</Affiliation>
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<AffiliationInfo><Affiliation>SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Sciences, Menlo Park, CA, United States of America.</Affiliation>
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<ForeName>John M</ForeName>
<Initials>JM</Initials>
<AffiliationInfo><Affiliation>Department of Physics, Harvard University, Cambridge, MA, United States of America.</Affiliation>
</AffiliationInfo>
<AffiliationInfo><Affiliation>Harvard-MIT Center for Ultracold Atoms, Cambridge, MA, United States of America.</Affiliation>
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<Month>07</Month>
<Day>01</Day>
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<CoiStatement>The authors of this paper have read the journal’s policy and have the following competing interests: S.C. and Y.C. are the co-founders of 4C Air and owns the shares of 4C Air. L.L and W.X. are paid employees of 4C Air. S.C. and Y.C. report non-financial support from 4C Air (https://www.4cair.com/). In addition, S.C. and Y.C. have a patent PCT/US2015/065608 (Air filter for high-efficiency pm2.5 capture) licensed to 4C Air. 4C Air tested face masks from several manufacturers that include 4C Air’s masks and those of other manufacturers. This does not alter our adherence to PLOS ONE policies on sharing data and materials.</CoiStatement>
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A scalable method of applying heat and humidity for decontamination of N95 respirators during the COVID-19 crisis.

A scalable method of applying heat and humidity for decontamination of N95 respirators during the COVID-19 crisis.

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