Published in Medical Letter on the CDC and FDA, December 18th, 2011
"An oxygen mask incorporating a high-efficiency particulate (HEPA) filter may reduce the chance of inhaling airborne particles. In a randomized controlled crossover volunteer study, the median ratio of ambient:intramask 0.02 to 1-mu particles was significantly higher for the HEPA oxygen mask than for a Hudson-type mask (P < .001), and was >= 100 in 59%-64% of subjects," wrote J.K.M. Wai and colleagues, Chinese University of Hong Kong.
The researchers concluded: "The use of HEPA...
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