Said one-way valve makes it mostly ineffective at preventing aerosols from exiting, and in addition coughs or sneezes while wearing a mask will force air out around the seal.
The filter pictured (yellow label) is appropriate for VOCs and acid gases- acceptable for working around untreated sewage, but water droplets will land on the filter media, evaporate, and the virus particles will be pulled through by inhalation.
The large variety in industrial respiration needs has resulted in a moderate variety of masks and a large variety of filters for those masks. The amount of education required to get the public up to speed on what they need to wear will be extensive, and there’s still a supply problem.
Yes, this mask is more of a symbolic pic, perhaps Simon can briefly explain why he chose this one (copyright issues I think). As explained in my original post and mentioned above you should use P3/ N99 or N100 filters.
They looked at about 100 infected households and sampled surfaces. Found virus RNA everywhere but NO viable virus. Also if that were false we would see airborne spread with people being infected over much larger spacial and temporal distance.
The public needs not be educated on what to wear, correct masks need to be provided by public private partnership (state money is used to stimulate large scale production) to stand a chance of equipping most people in a few month. You may want to use the original post linked.
It’s one thing to say that C19 can’t survive long enough on dry surfaces or in the air to infect someone over a few feet away. The time between a water droplet drying on a carbon filter and the virus particle being in the airway of the mask-wearer is shorter than the time delay between sampling a surface and testing it for viable virus. There’s a huge difference between tests that would tell if C19 remains viable for a few seconds after drying out and tests that would tell if it remains viable on the order of how long it takes to inhale.
It looks like an exhaust port that incorporated a heat sink and moisture separator is plausibly more effective at preventing pathogen escape, but it has to be high-volume enough to pass a sneeze without it blowing out along the face.
Said one-way valve makes it mostly ineffective at preventing aerosols from exiting, and in addition coughs or sneezes while wearing a mask will force air out around the seal.
The filter pictured (yellow label) is appropriate for VOCs and acid gases- acceptable for working around untreated sewage, but water droplets will land on the filter media, evaporate, and the virus particles will be pulled through by inhalation.
The large variety in industrial respiration needs has resulted in a moderate variety of masks and a large variety of filters for those masks. The amount of education required to get the public up to speed on what they need to wear will be extensive, and there’s still a supply problem.
Yes, this mask is more of a symbolic pic, perhaps Simon can briefly explain why he chose this one (copyright issues I think). As explained in my original post and mentioned above you should use P3/ N99 or N100 filters.
Current understanding is that CoV-2 becomes nonviable when dried out Results form this study, though not in the document: (https://www.land.nrw/sites/default/files/asset/document/zwischenergebnis_covid19_case_study_gangelt_0.pdf).
Same guy stated it here: https://www.zeit.de/wissen/gesundheit/2020-04/hendrik-streeck-covid-19-heinsberg-symptome-infektionsschutz-massnahmen-studie/seite-2
They looked at about 100 infected households and sampled surfaces. Found virus RNA everywhere but NO viable virus. Also if that were false we would see airborne spread with people being infected over much larger spacial and temporal distance.
The public needs not be educated on what to wear, correct masks need to be provided by public private partnership (state money is used to stimulate large scale production) to stand a chance of equipping most people in a few month. You may want to use the original post linked.
It’s one thing to say that C19 can’t survive long enough on dry surfaces or in the air to infect someone over a few feet away. The time between a water droplet drying on a carbon filter and the virus particle being in the airway of the mask-wearer is shorter than the time delay between sampling a surface and testing it for viable virus. There’s a huge difference between tests that would tell if C19 remains viable for a few seconds after drying out and tests that would tell if it remains viable on the order of how long it takes to inhale.
You might find https://jamanetwork.com/journals/jama/fullarticle/2763852 of interest in the discussions as well. Both related to the question of just how fast the droplets might dry in air and how well the masks might work in terms of protecting others.
As I read the bit we might need to consider the protection as asymmetric—keeps more out than, possible, in even without considering an exhaust valve.
It looks like an exhaust port that incorporated a heat sink and moisture separator is plausibly more effective at preventing pathogen escape, but it has to be high-volume enough to pass a sneeze without it blowing out along the face.
Yep, it’s simply the first one in open domain that I found. I hope it’s not too misleading; it should get the general idea across.
Using a picture of a product to illustrate a discussion about it would be fair use even if there were copyrightable elements of the picture.