Aerosol penetration behavior of respirator valves

American Industrial Hygiene Association Journal
L M Brosseau

Abstract

Exhalation and inhalation valves from half-facepiece negative pressure respirators were evaluated for leakage during an 8-hour cyclic breathing test period using two work rates (415 and 622 kg-m/min) and two particle sizes (0.3 and 0.8 micron). Three different models (manufacturers) of exhalation valves were tested, with two lots for each model. Exhalation valve leakage ranged from 0.0 to 0.03%; no failure of exhalation valves occurred. No differences in lot or manufacturer were found. Differences in particle size did not lead to differences in penetration at the lower work rate; at the higher work rate 0.3-micron particles were less penetrating than 0.8-micron particles (0.03 versus 0.06%). When tested for air leakage at a pressure of 2.54 cm H2O, following the National Institute for Occupational Safety and Health certification method, exhalation valves exhibited no leakage either before or after the experiments. Inhalation valves averaged 20% leakage for all experiments; 0.3-micron particles were again less penetrating (13%) than 0.8-micron particles (27%). No inhalation valve failure occurred. No differences in lot (within manufacturer) were found; there were, however, significant differences in particle penetration among th...Continue Reading

Citations

Aug 12, 2003·Applied Occupational and Environmental Hygiene·Erin M Snyder, Roy T McKay
Jan 28, 2016·Journal of Biomedical Optics·Chukwuemeka Okoro, Kimani C Toussaint
Jul 13, 2016·Journal of Biomedical Optics·Alexander DoroninIgor Meglinski
Mar 2, 2016·Journal of Biomedical Optics·Sergey SavenkovKateryna Chunikhina
Apr 29, 2016·Journal of Biomedical Optics·Valery V Tuchin
Aug 25, 2017·Journal of Biomedical Optics·Chukwuemeka Okoro, Kimani C Toussaint
Aug 2, 2017·Journal of Occupational and Environmental Hygiene·Norbert SerfozoVladimír Ždímal

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