Air purifiers and masks help reduce the risk of exposure to the airborne SARS-Covi 2 virus.

Air purifiers and masks help reduce the risk of exposure to the airborne SARS-Covi 2 virus.

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2021-07-24 02:58:52

In view of the complicated developments of the Covid-19 epidemic, in order to prevent the spread of the virus at this time, strict compliance with the Government’s 5K messages including: Masks, Disinfection, Distance, Do not gather Training and Medical Declarations are always recommended to be done anytime, anywhere.

According to information on the official website of WHO, Covid-19 is transmitted in people through direct, indirect contact (through contaminated objects or surfaces), or close contact with infected people through secretions from the mouth and nose.

When infected people speak, cough or even breathe, the virus is released into space in various sizes. While large droplets will fall to the ground quickly, much smaller virus-carrying particles will remain suspended in the air for up to 30 minutes or longer until being sucked away by ventilation or ventilation systems. air purifier (according to the Centers for Disease Control – US CDC)

Photo source: Coway Vina

In addition, the US CDC report also recommends using air purifier products with HEPA filters to enhance the ability to clean the air. Research shows that the particle size of SARS-CoV-2 is about 0.1 micro-meter (µm). These viruses are contained in respiratory droplets less than 5 micrometers in size. The HEPA filter will be able to capture 99.97% of particles that are 0.3 micrometers in size. “Therefore, HEPA filters are not less than 99.97% efficient in capturing particles containing the SARS-CoV-2 virus from the human body” – according to the Building Ventilation proposal on the English website. Vietnam by US CDC updated on June 2, 2021.

According to a recent study on the effectiveness of HEPA filters and masks in preventing exposure to SARS-CoV-2 virus particles published in the US CDC on July 9, 2021, researchers used a device that simulates the droplets of a person infected with Covid and two other normal people in a closed room. This room is equipped with 2 air purifiers using HEPA filters that meet the clean air distribution ratio recommended by the Environmental Protection Agency (EPA). Specifically, according to the report, if 2 air purifiers are used but no masks are used, the risk of exposure to simulated virus particles can be reduced by 65%. Without using an air purifier but using a mask, the concentration of droplets was reduced by 72%. Combining 2 air purifiers equipped with HEPA filters with masks can reduce the risk of exposure by up to 90%. HEPA filters will work best if placed near the source of disease. This research has also been published in many prestigious foreign newspapers such as Business Korea of ​​Korea or Compas of Indonesia.

Although limited, research has also shown the impact of air purifiers with HEPA filters and masks. The infection depends on many factors such as the amount of virus in the seed, the time the virus stays in the air, the vaccination status of the contact, etc., so people still need to strictly adhere to the 5K message of the Government. government. If a consumer is considering buying an air purifier equipped with a HEPA filter, the following factors should be carefully considered when choosing a filter: the thickness and strength of the filter, whether the filter is fitted tightly to the inside. in the filter or not. In addition, the capacity of the air purifier must also be suitable for the area of ​​the room and the filter should be cleaned and periodically cleaned to ensure efficiency.

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