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. 2020 Aug 29;58(6):573–580. doi: 10.2486/indhealth.2020-0056

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©2020 National Institute of Occupational Safety and Health

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives (by-nc-nd) License.

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Fig. 3. — Leakage rate of each wearing variation.

(n=10) Vertical axis shows the leakage rate (%) and horizontal axis shows the wearing variations. Logarithmic scale on vertical axis is used to provide a clear presentation of results. The horizontal line on the graph indicates a leakage rate of 5.0%. RPR: replaceable particulate respirator; PAPR: powered air-purifying respirator; -R: worn according to the recommended method; -K: worn with a knit cover between the facepiece cushion and face; -T: worn by placing a towel between the facepiece cushion and face; -H: worn with the headband on a helmet.