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Surgical Masks. A surgical mask is a loose-fitting, disposable device that creates a physical barrier between the mouth and nose of the wearer and potential contaminants in the immediate environment.Face Masks and Surgical Masks for COVID-19: Face masks, when they are intended for a medical purpose such as source control (including uses related to COVID-19) and surgical masks are medical devices. Q: Is there a difference between a mask high dust suppression efficiency grade a medical maskDoes That Face Mask Really Protect You?the dust mask had the worst efficiency at 6.1%. The reference N95 mask efficiency was 89.6%. Mannequin filter sample concentrations, reference sample concen-trations, and mask efficiency data are presented in Ta-bles 1-4 for surgical, pre-shaped dust mask, bandana, and N95 face masks

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