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Original file (725 × 612 pixels, file size: 52 KB, MIME type: application/pdf, 2 pages) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
The following other wikis use this file: Usage on af.wikipedia.org Lapgesigsmasker; Usage on ar.wikipedia.org قناع وجه قماشي; Usage on de.wikipedia.org
A medical certificate or doctor's certificate [1] [2] is a written statement from a physician or another medically qualified health care provider which attests to the result of a medical examination of a patient. [3] It can serve as a sick note (UK: fit note) (documentation that an employee is unfit for work) or evidence of a health condition. [4]
mouth-bit respirators, which fit in the mouth with the nose pinched shut (escape only) quarter-mask or orinasal mask, covering the mouth and nose only; half-mask, from below the eyes to below the chin; fullface mask, from above the eyes to below the chin; Some elastomeric masks include one-way valves to let exhaled air out unfiltered.
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A surgical mask may not block all particles, due to the lack of fit between the surface of the face mask and the face. [45] The filtration efficiency of a surgical mask ranges between 10% and 90% for any given manufacturer, when measured using tests required for NIOSH certification.
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] The corresponding face mask used in the European Union is the FFP2 respirator. [55] [56] Hard electret-filter masks like N95 and FFP masks must fit the face to provide full protection. Untrained users often get a reasonable fit, but fewer than one in four gets a perfect fit. Fit testing is thus standard, though debated.