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5. Influence of various external condition parameters on penetration
The filtration efficiency of a mask is represented by its ability to retain particles and microbes in the air. It is specified as an efficiency ratio and includes particle size, quantity of air filtered and operating time . From a fluid mechanics point of view, certain elements play an important role, such as flow rates, aerosol size, gaps between face profiles and masks, corresponding flow resistance, etc.
5.1 Particle size and shape
Filter efficiency depends on particle size; for example, in the particle...
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Influence of various external condition parameters on penetration
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Bibliography
Bibliography
Standards and norms
- Respiratory protection devices – Particle filtering half-masks – Requirements, testing, marking - NF EN 149 + A1 - 09/09
- Acoustics – Isosonic level calculation method - ISO 532 - 1975
Regulations
Law no. 83-634 of July 13, 1983 on rights and obligations... (consolidated version of March 3, 2002)
Décret n° 2000-44 du 13 janvier 2000 portant... (consolidated version as of October 5, 2007) JO n° 11 du 14 janvier 2000 page 369 NOR : FPPA9910013D.
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Patent N202031044170 was filed on December 4, 2020 by Sankha Dey, Sarthak Chatterjee, Saikat Pal, and Dr. Biswarup Neoget. Title: Anti-COVID-19 mask with integrated eye, nose and mouth protection alarm system.
Patent CN111194953 filed May 26, 2020; entitled: The high-temperature anti-virus...
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