Health
“Double masking” has almost no effect.The important thing is the fit
According to a Covid-19 study, efforts to prevent illness through double masking with improperly worn masks may not significantly improve efficiency while giving the wearer a false sense of security. I have.
US health authorities have already recommended wearing N95 and KN95 masks. These have been found to have the best protection against illness, while cloth masks are loosely woven and therefore have the lowest protection.
However, researchers at Florida State University (FSU) have said that more than two years after the pandemic began, they do not yet fully understand the properties of masks for optimal protection.
They used a technique called Principal Component Analysis (PCA) with a hydrodynamic simulation model to ensure a proper fit for all types of masks and how the facial shape fits the ideal fit. Showed if it affects.
More layers mean less porous face covering, leading to more flow pushed out of the gaps (sides, top, and bottom) around the mask with a less secure fit. The double layer improves filtering efficiency, but only with good masks. The downside is that a tight fit can also lead to respiratory distress.
Researchers modeled a moderate cough jet from the mouth of an adult man wearing a cloth mask with a rubber band around his nose and mouth. They calculated the maximum volumetric flow through the gap between the front and the periphery of the mask at the porosity level of the various materials.
For a more realistic 3D face shape and size, researchers used a PCA that integrates the heads of 100 adult men and 100 adult women taken from headscan data from the University of Basel, Switzerland.
Their model showed how the slight asymmetry typical of all facial structures affects proper mask fitting. For example, the mask may fit better on the left side than on the right side of the face.
“Face asymmetry is barely perceptible to the eye, but is manifested by the flow of cough through the mask,” said FSU co-author Tomas Solano.
“In this particular case, unfiltered leaks are only observed from the top, but different face shapes can also leak from the bottom and sides of the mask.”
Creating a customized “designer mask” for each person’s face is not practical on a large scale. Still, different populations by using PCA-based simulations to reveal the general differences in facial structure between men and women, or children and the elderly, and the associated air flow through the mask. You can design a mask suitable for.
According to last year’s survey at the University of Cambridge, a face mask that fits snugly Equally important As the material from which it is made to ensure maximum protection against Covid-19.
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