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Old 05-28-2020, 10:26 AM
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Lucy Lucy is offline
Join Date: Sep 2001
Posts: 7,750

A study about the importance of fit, showing the improved efficacy of various types of masks when adding a "nylon overlayer"

Quantitative Method for Comparative Assessment of Particle Filtration Efficiency of Fabric Masks as Alternatives to Standard Surgical Masks for PPE

And a more readable summary of the takeaway, which is that you can make almost any mask work pretty well if you use a slice of a nylon stocking to hold it tightly over your face, complete with an illustration of how to do that:

Adding A Nylon Stocking Layer Could Boost Protection From Cloth Masks, Study Finds
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