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- W3204103801 abstract "Abstract Respiratory viruses are capable of transmitting via an aerosol route. Emerging evidence suggests that SARS-CoV-2 which causes COVID-19 can be spread through airborne transmission, particularly in indoor environments with poor ventilation. Heating, ventilation, and air conditioning (HVAC) systems can play a role in mitigating airborne virus transmission. We conducted a systematic review of the scientific literature examining the effectiveness of HVAC design features in reducing virus transmission—here we report results for ultraviolet (UV) radiation. Following international standards for systematic reviews, we conducted a comprehensive search and synthesized findings from 32 relevant studies published between 1936 and 2020. Research demonstrates that: viruses and bacteriophages are inactivated by UV radiation; increasing UV dose is associated with decreasing survival fraction of viruses and bacteriophages; increasing relative humidity is associated with decreasing susceptibility to UV radiation; UV dose and corresponding survival fraction are affected by airflow pattern, air changes per hour, and UV device location; and UV radiation is associated with decreased transmission in both animal and human studies. This comprehensive synthesis of the scientific evidence examining the impact of UV radiation on virus transmission can be used to guide implementation of systems to mitigate airborne spread and identify priorities for future research. Practical Implications In-duct ultraviolet germicidal irradiation (UVGI) addresses virus transmission throughout the heating, ventilation, and air conditioning (HVAC) system of a building as a whole; whereas, upper-room UVGI addresses virus transmission in one room of that building. The susceptibility of a virus is often determined from the relationship between UV dose and survival fraction of the virus, and can be affected by relative humidity. Modelling studies revealed that practical implementation of UVGI in HVAC systems should consider airflow patterns, air changes per hour, and UV device location. Future field studies of UVGI systems could address an existing research gap and provide important information on system performance in real-world situations." @default.
- W3204103801 created "2021-10-11" @default.
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- W3204103801 date "2021-10-14" @default.
- W3204103801 modified "2023-09-26" @default.
- W3204103801 title "The impact of heating, ventilation, and air conditioning design features on the transmission of viruses, including the 2019 novel coronavirus: a systematic review of ultraviolet radiation" @default.
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- W3204103801 doi "https://doi.org/10.1101/2021.10.12.21264904" @default.
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