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The anti-Covid-19 rules have imposed new requirements in restaurants, classrooms and other public places with the aim of achieving the principle of social distancing and separating people from each other through insulating plastic barriers.

newspaper says,The New York TimesQuoting scientists, plastic barriers that are supposed to protect against germs and viruses do not help reduce the spread of Corona virus infection and give people a false sense of safety.

Under normal conditions in shops, classrooms, and offices, small airborne particles are dispersed by air currents and, depending on the ventilation system, are replaced with fresh air approximately every 15 to 30 minutes. But building plastic barriers can alter the airflow mechanism in a room, disrupting normal ventilation and creating “dead zones”, where particles can build up in certain areas and become highly concentrated.

A study published in June led by researchers from Johns Hopkins University in the United States showed that office barriers in the classroom are associated with an increased risk of infection with the Corona virus.

In the Massachusetts School District, researchers have found that glass partitions in the side walls of the main office obstruct airflow.

A study looking at schools in Georgia also found that office barriers had less impact on the spread of the coronavirus than improvements in ventilation.

Before the epidemic, a study published in 2014 found that office divisions were among the factors that may have contributed to tuberculosis transmission in Australia.

Catherine Knox, professor of environmental engineering for buildings at the University of Leeds, said erecting barriers sounds like a good idea but could have unintended consequences.

She added, “The effect is to block larger particles, but smaller atmospheric particles move over the barriers and mix in room air within about 5 minutes. This means that if people interact for more than a few minutes, they are likely to be exposed to the virus regardless of the presence of the barriers.” .

The researchers say that plastic or glass barriers are likely to help in very specific situations, for example the bus driver is protected from the rest of the passengers by a barrier that extends from floor to ceiling, as well as the cashier at the bank who sits behind a wall of glass or a clerk registering patients in an office Doctor, they are partially protected from transmission.

“I think this could be a problem, especially in places like classrooms where people are around for longer periods of time,” Knox said.

“Too many barriers impede air flow and create higher risks that are difficult to identify,” she said.





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