Effect of Exhaled Moisture on Breathing Resistance of N95 Filtering Facepiece Respirators | Zendy

Raymond J. Roberge | Zendy; Emily Bayer | Zendy; Jeffrey B. Powell | Zendy; Aitor Coca | Zendy; Marc R. Roberge | Zendy; Stacey Benson | Zendy

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Effect of Exhaled Moisture on Breathing Resistance of N95 Filtering Facepiece Respirators

Author(s) -

Raymond J. Roberge,

Emily Bayer,

Jeffrey B. Powell,

Aitor Coca,

Marc R. Roberge,

Stacey Benson

Publication year - 2010

Publication title -

the annals of occupational hygiene

Language(s) - English

Resource type - Journals

eISSN - 1475-3162

pISSN - 0003-4878

DOI - 10.1093/annhyg/meq042

Subject(s) - respirator , exhalation , breathing , ventilation (architecture) , inhalation , moisture , biomedical engineering , medicine , materials science , anesthesia , composite material , engineering , mechanical engineering

This study evaluated the effect of exhaled moisture on the breathing resistance of three classes of filtering facepiece respirators (FFR) following 4 h of continuous wear at a breathing volume of 40 l min(-1), utilizing an automated breathing and metabolic simulator as a human surrogate. After 4 h, inhalation and exhalation resistance increased by 0.43 and 0.23 mm of H(2)O pressure, respectively, and average moisture retention in the respirators was 0.26 ml. Under ambient conditions similar to those of the current study, and at similar breathing volumes, it is unlikely that exhaled moisture will add significantly to the breathing resistance of filtering facepiece respirators (FFR) over 4 h of use.

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