If you are wondering whether air purifiers can help prevent the spread of disease, especially COVID-19, you might be interested in the latest scientific findings on this topic. In this blog post, we will explain how air purifiers work, why a HEPA filter is important, and what the research says about the BlueAir 211+ Air Purifier.
How do air purifiers work?
Air purifiers are devices that remove particles and pollutants from the air, such as dust, pollen, smoke, and viruses. There are two main types of air purifiers: filters and air disinfectors. Filters work by trapping particles in a mesh or a fibrous material, while air disinfectors use ultraviolet radiation or ozone to kill or inactivate viruses and bacteria in the air.
Why is a HEPA filter important?
A HEPA filter is a type of filter that can capture 99.97% of particles that are 0.3 microns or larger in diameter. This means that it can effectively remove most of the airborne particles that can carry infectious diseases, such as influenza, tuberculosis, and COVID-19. A HEPA filter is usually combined with other filters, such as activated carbon or ionizers, to enhance its performance and reduce odors and gases.
The BlueAir 211+ Air Purifier is one of the most popular and highly rated air purifiers on the market. It claims to have a CADR (clean air delivery rate) of 350 cubic feet per minute, which means that it can clean the air in a 540-square-foot room five times per hour. It also has a three-stage filtration system that includes a pre-filter, a particle filter, and an activated carbon filter.
However, according to a recent systematic review by Hunter et al. (2023), there is no compelling evidence that air purifiers prevent respiratory infections. The review analyzed 32 studies conducted before COVID-19 and found that air treatment technologies did not reduce either the frequency or the severity of illness from respiratory viruses. The review also found evidence of publication bias, which means that positive results were more likely to be published than negative ones.
Another study by Schönfeld et al. (2021) investigated the effect of HEPA filters on COVID-19 transmission in kindergartens in Germany. The study compared infection rates in schools that had new filters installed with those that did not. The study found no significant difference between the two groups. In fact, infection rates were slightly higher in children in schools that had the filters installed.
Therefore, based on the current evidence, it seems that air purifiers are not very effective at preventing the spread of disease, especially COVID-19. However, this does not mean that they are useless or harmful. Air purifiers can still improve indoor air quality and reduce allergens and irritants that can cause asthma and other respiratory problems. They can also complement other preventive measures, such as ventilation, masking, distancing, and vaccination.
If you want to buy an air purifier for your home or office, you should consider several factors, such as the size of your room, the type and quality of the filter, the noise level, the energy consumption, and the cost. You should also check the product reviews and ratings from reputable sources and compare different models and brands. The BlueAir 211+ Air Purifier may be a good option for some homes.
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