"And there’s another problem: too much filtration becomes unbreathable. “Are you breathing through the material, or are you breathing through the gaps in the material?” Zangmeister says.
https://twitter.com/katherineefoley/status/1358820709338865667
2/ "If you’re breathing through the gaps in between the mask and your face, you’re not getting any filtration production at all."
#covid19 #BetterMasks
#covid19 #BetterMasks
3/ "In lab settings, Zangmeister and his team have found these areas where air escapes tend to be behind the cheeks, or right above the bridge of the nose, which can look like a droplet exhalation geyser, he says. "
4/ "There’s a simple test to see if your masks aren’t actually working as a filter...Go outside on a cold day, & wear either glasses or sunglasses & breathe for 30 seconds. If your breath fogs the glasses, too much air may be leaving (& therefore coming in) above your nose"
5/ I am aware and currently peripherally involved with this @ASTMIntl effort.
This will be a key part of #BetterMasks movement.
This will be a key part of #BetterMasks movement.
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