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Lots of commercially offered masks in hospital inventories perform similarly to N95 masks for aerosol filtration of 0.2 μm and overhead, but there is however a variety of masks with reasonably reduced purification efficiencies (age.g., 90%) and a subset with poorer filtration (e.g., 70%). All masks functioned acceptably for breathability, and impedance had not been correlated with purification efficiency.With simplified examinations, companies with
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