Article | REF: MED7800 V1

Efficiency of filtration through respiratory protection masks

Authors: Sedigheh FARZANEH, Mohammadali SHIRINBAYAN, Michel BOCQUET, Abbas TCHARKHTCHI

Publication date: April 10, 2022

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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

(1) - TCHARKHTCHI (A.), SEYDANI (M.Z.), ZIRAK (N.), FARZANEH (S.), SHIRINBAYAN (M.) - An overview of filtration efficiency through the masks: Mechanisms of the aerosols penetration. - Bioactive materials, vol. 6, n° 1, p. 106-122 (2021).
(2)...

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

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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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