Fitted Filtration Efficiency of Double Masking During the COVID-19 Pandemic | Otolaryngology | JAMA Internal Medicine | JAMA Network

Although adding a procedure mask (mean [SD] FFE, 61% [13%]) over the cloth masks provided modest increases in their FFE (mean [SD] range, 55% [10%] to 60% [14%]), the overall performance was no different than wearing the procedure mask by itself. In contrast, wearing a procedure mask under the cloth face covering produced marked improvements in overall FFE (mean [SD] range, 66% [5%] to 81% [6%]).

Source: Fitted Filtration Efficiency of Double Masking During the COVID-19 Pandemic | Otolaryngology | JAMA Internal Medicine | JAMA Network

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