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Taking this up to qt as longer answers.
"When we say 'Failed at the nose', what does that (quantitatively) mean? "
It failed fit testing. Presumably with a noticeable leak around the top of the nose.
"When we say 'Failed at the nose', what does that (quantitatively) mean? "
It failed fit testing. Presumably with a noticeable leak around the top of the nose.
"Does the mask (with that leak) now let 100% of the virus through?"
No. The virus is embedded in respiratory aerosols. If you were right next to the person, you would be more likely to get some of those aerosols around your face.
Even then, depending on the size of the leak,
No. The virus is embedded in respiratory aerosols. If you were right next to the person, you would be more likely to get some of those aerosols around your face.
Even then, depending on the size of the leak,
a good portion would hit the respirator and be stopped via the usual 4 processes involved.
If not next to them, air mixes very quickly in a room. Some could end up nowhere near you...rising on our body's thermal plume. Micro air currents could carry them away - or
If not next to them, air mixes very quickly in a room. Some could end up nowhere near you...rising on our body's thermal plume. Micro air currents could carry them away - or
