Analysis on Applicability of Air Purifiers in Schools to Prevent	the Spread of Airborne Infection of SARS-CoV-2

Han, Bangwoo; Kim, Sang-Bok; Lee, Gunhee; Hong, Gi-Jeong; Park, In-Yong; Kim, Hak-Joon; Lee, Ye-Wan; Jeong, Sang-Hyeon; Shim, Seong-Hoon; Kim, Jin‐Tae; Roh, Seon Ah; Tong, Min; Shin, Wan-Ho

doi:10.5572/kosae.2020.36.6.832

Cited by 5 publications

(3 citation statements)

References 19 publications

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“…The particles whose size was larger than 5 μm simulated droplets, and those whose size was smaller than 5 μm simulated droplet nuclei, whose spread is responsible for airborne infections. To assess the impact of the virus as a whole, the PM10 mass concentration was evaluated using the evaluation method used by Han et al [ 32 ].…”

Section: Methodsmentioning

confidence: 99%

Dispersion of droplets due to the use of air purifiers during summer: Focus on the spread of COVID-19

Kim²,

Kim

2023

Building and Environment

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Section: Methodsmentioning

confidence: 99%

Dispersion of droplets due to the use of air purifiers during summer: Focus on the spread of COVID-19

Kim²,

Kim

2023

Building and Environment

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“…Scientific evidence shows that air purifiers utilizing HEPA filters, together with good ventilation, effectively reduce aerosolized particles in a classroom setting (Curtius et al, 2020;Han et al, 2020;Bullister, 2021). Combined with mask use, these strategies counter the spread of COVID-19 even more effectively than social distancing alone (Foster & Kinzel, 2021).…”

Section: The Case For Hepa Air Purifiers In Schoolsmentioning

confidence: 99%

Practical Mitigation Strategies for Countering the Spread of Aerosolized COVID-19 Virus (SARS-CoV-2) Using Ventilation and HEPA Air Purifiers: A Literature Review

Polyzois¹,

Thompson²

2021

GEP

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This paper assesses, through an extensive literature review, the use of ventilation and High-Efficiency Particulate Air (HEPA) purifiers as practical mitigation strategies for reducing the spread of aerosolized COVID-19 1 virus. HEPA is a well-defined standard by the U.S. Department of Energy for filters. The focus of the literature review was on indoor air quality (IAQ) and COVID-19, with a particular emphasis on classroom settings. The start of the review, January 2020, was chosen to coincide with the first cases of COVID-19 in North America. Although children under the age of 12 are currently not yet vaccinated, there is mounting pressure for a return to normal by the start of the new school year, 2021. Also, many classrooms lack pre-installed mechanical ventilation systems (Olsiewski et al., 2021); therefore, mitigation in classrooms often falls solely in the hands of teachers and students. Research shows that ventilation and air purification are essential tools to counter aerosolized transmission (<5 µm) of the COVID-19 virus. According to Curtius et al., (2020), the inhaled dose of particles containing virus RNA is six times lower when using air purifiers with an ACH (air changes per hour) of 5.7. However, ventilation and air purifiers are not replacements for masks, which remain vital for countering droplet (>5 µm) transmission. In addition, occupancy (i.e., number and proximity of people present in a given area) and group activity levels (e.g., talking, shouting, singing) play a critical role in viral transmission. Although natural ventilation by opening windows can be an essential strategy to help counter the spread of the virus, the level of ventilation offered by opening windows is largely uncontrollable as it is subject to weather 1 COVID-19 refers to the disease which is developed once sufficient viral transmission occurs. The virus itself which causes COVID-19 is labeled as "severe acute respiratory syndrome Coronavirus 2," otherwise known as SARS-CoV-2, and sometimes called the "COVID-19 virus" (WHO, 2020b

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“…우 빠른 전파력을 갖는다. 주로 감염된 사람과 대화하거나 기침할 때 그리고 호흡할 때 나오는 비말에 의하여 감염되는 비말감염을 주요 전 파요인으로 보고 있다 8) . 치과는 환자의 구강 내 질환을 치료하는 곳으 로 치과 진료의 특성상 비말 접촉이 당연하게 될 수밖에 없다 9) 12) 적절한 예방 조치가 없으면 범유행 기간 동안 치과 진료가 제한될 것 으로 예측하였다 13) .…”

Section: Covid-19는 사람과 여러 동물이 감염될 수 있는 바이러스로 매unclassified

Impact of COVID-19 on dental technicians

Bae

2021

Journal of Korean Academy of Oral Health

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Objectives:The purpose of this study is to investigate the impact of COVID-19 on dental technicians and dental laboratories. Methods: In June 2020, self-reported questionnaires were distributed to and completed by dental technicians who attended the Seoul Dental Technologist Association's academic conference (n=210). The responses were cross analyzed with frequency analysis (α=0.05). Results: Due to COVID-19, the number of employees has decreased to less than 20%, and sales of dental laboratories have decreased by 21-40%. On the Likert 5-point scale for individual precautions, 'I wear a mask when using public transportation' was the highest at 4.80. If infected with COVID-19, 'my family's infection is most concerned' was the highest 3.89, but there was no significant difference between having children under the age of 13 in the family and having an elderly family over 65 years old (P>0.05). Conclusions: To prevent infection by dental technicians, it is mandatory to check body temperature when going to work and refrain from eating while working. As COVID-19 continues for a long time, it is necessary to continuously investigate the status of infected persons among dental technicians and vaccination rates as health care workers.

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Analysis on Applicability of Air Purifiers in Schools to Prevent the Spread of Airborne Infection of SARS-CoV-2

Cited by 5 publications

References 19 publications

Dispersion of droplets due to the use of air purifiers during summer: Focus on the spread of COVID-19

Dispersion of droplets due to the use of air purifiers during summer: Focus on the spread of COVID-19

Practical Mitigation Strategies for Countering the Spread of Aerosolized COVID-19 Virus (SARS-CoV-2) Using Ventilation and HEPA Air Purifiers: A Literature Review

Impact of COVID-19 on dental technicians

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