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Originally posted at FluTrackers
Reusing Masks
http://www.flutrackers.com/forum/showthread.php?t=2802&goto=nextnewest
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See: : http://www.flutrackers.com/forum/showthread.php?t=5342
Quote:
The effectiveness of a face mask decreases as the mask material becomes saturated, so re-use or extended use is not wise if you are in a contaminated environment. This is exacerbated if you are wearing a mask in a
cold environment as there is increased condensation on the mask material. There are N95 type masks with an exhaust vent that protects the filtering surfaces from compromise by moisture. (I've worn N95 masks outdoors in the Canadian winter and had most of the filter surface blocked by frost in short order)
The WHO recommends changing surgical type masks every two hours and N95 masks every 6-8 hours. (http://www.wpro.who.int/sars/docs/masks/masks_faq.asp)
from thread: http://www.flutrackers.com/forum/showthread.php?t=12144