Exhaled SARS-CoV-2 aerosol infectivity enables Covid-19 transmission in minutes
1–10 of 33 posts
Re: Exhaled SARS-CoV-2 aerosol infectivity enables Covid-19 transmission in minutes
#2My family wore 3M's best face masks for the US market, i.e., N95, and we still got it a few times. We switched to FFP3, equivalent to N99, and there have been no infections so far.
I am surprised how bad people are at basic arithmetic! A N99 face mask is 5 times better than a N95 one, not just 4% better!
So, I wonder why FFP3 is only available in Europe. I buy the FFP3 face masks, which are manufactured in Poland, from a UK online retailer, but this is sad, given that 3M is an American company.
Re: Exhaled SARS-CoV-2 aerosol infectivity enables Covid-19 transmission in minutes
#3My family wore 3M's best face masks for the US market, i.e., N95, and we still got it a few times. We switched to FFP3, equivalent to N99, and there have been no infections so far. I am surprised how bad people are at basic arithmetic! A N99 face mask is 5 times better than a N95 one, not just 4% better! So, I wonder why FFP3 is only available in Europe. I buy the FFP3 face masks, which are manufactured in Poland, fr…
Those are absolutely not 3M's best face masks, if you want half face and low profile the 650X (6502 is medium) elastometic respirator is good, when combined with P100 filters, if you want full face you could look to see if they still sell the CBRN hardened respirator and filter sets.
Re: Exhaled SARS-CoV-2 aerosol infectivity enables Covid-19 transmission in minutes
#4My family wore 3M's best face masks for the US market, i.e., N95, and we still got it a few times. We switched to FFP3, equivalent to N99, and there have been no infections so far. I am surprised how bad people are at basic arithmetic! A N99 face mask is 5 times better than a N95 one, not just 4% better! So, I wonder why FFP3 is only available in Europe. I buy the FFP3 face masks, which are manufactured in Poland, fr…
Those are absolutely not 3M's best face masks, if you want half face and low profile the 650X (6502 is medium) elastometic respirator is good, when combined with P100 filters, if you want full face you could look to see if they still sell the CBRN hardened respirator and filter sets.
Of course these types of respirators have an exhalation valve and would be a dick move to wear anywhere that requires masks. If you’re contagious you’ll be spewing virus all over just like someone with no mask on.
Re: Exhaled SARS-CoV-2 aerosol infectivity enables Covid-19 transmission in minutes
#5My family wore 3M's best face masks for the US market, i.e., N95, and we still got it a few times. We switched to FFP3, equivalent to N99, and there have been no infections so far. I am surprised how bad people are at basic arithmetic! A N99 face mask is 5 times better than a N95 one, not just 4% better! So, I wonder why FFP3 is only available in Europe. I buy the FFP3 face masks, which are manufactured in Poland, fr…
10 FFP3 masks from Amazon UK delivered to U.S. cost $30.24 — just ordered them:
https://www.amazon.co.uk/FFP3-Masks-Pack-Filtration-Efficien...
Thank you VERY MUCH for your comment; I had NO IDEA FFP3 masks are so much better than N95 — and I am a (retired) anesthesiologist who knows a thing or three about masks.
I wonder why FFP3 masks aren't made here in the U.S.
Re: Exhaled SARS-CoV-2 aerosol infectivity enables Covid-19 transmission in minutes
#6Earlier quoted context omitted.
Those are absolutely not 3M's best face masks, if you want half face and low profile the 650X (6502 is medium) elastometic respirator is good, when combined with P100 filters, if you want full face you could look to see if they still sell the CBRN hardened respirator and filter sets.
Of course these types of respirators have an exhalation valve and would be a dick move to wear anywhere that requires masks. If you’re contagious you’ll be spewing virus all over just like someone with no mask on.
On the other hand, if it prevents you from getting infected in the first place...
Re: Exhaled SARS-CoV-2 aerosol infectivity enables Covid-19 transmission in minutes
#7> Calculations with an indoor air transmission model showed that if an infected individual with this emission rate entered a room, a susceptible person would inhale an infectious dose within 6 to 37 min in a room with normal ventilation.
If this model were accurate, the R would be way higher. So it seems likely that this model misses important aspects.
Re: Exhaled SARS-CoV-2 aerosol infectivity enables Covid-19 transmission in minutes
#8My family wore 3M's best face masks for the US market, i.e., N95, and we still got it a few times. We switched to FFP3, equivalent to N99, and there have been no infections so far. I am surprised how bad people are at basic arithmetic! A N99 face mask is 5 times better than a N95 one, not just 4% better! So, I wonder why FFP3 is only available in Europe. I buy the FFP3 face masks, which are manufactured in Poland, fr…
Because FFP3 is a European standard, and you can buy N99 or P100 masks in the US?
Re: Exhaled SARS-CoV-2 aerosol infectivity enables Covid-19 transmission in minutes
#9Earlier quoted context omitted.
Those are absolutely not 3M's best face masks, if you want half face and low profile the 650X (6502 is medium) elastometic respirator is good, when combined with P100 filters, if you want full face you could look to see if they still sell the CBRN hardened respirator and filter sets.
Of course these types of respirators have an exhalation valve and would be a dick move to wear anywhere that requires masks. If you’re contagious you’ll be spewing virus all over just like someone with no mask on.
There are half-mask respirators with “source control”.
Re: Exhaled SARS-CoV-2 aerosol infectivity enables Covid-19 transmission in minutes
#10Earlier quoted context omitted.
Those are absolutely not 3M's best face masks, if you want half face and low profile the 650X (6502 is medium) elastometic respirator is good, when combined with P100 filters, if you want full face you could look to see if they still sell the CBRN hardened respirator and filter sets.
Of course these types of respirators have an exhalation valve and would be a dick move to wear anywhere that requires masks. If you’re contagious you’ll be spewing virus all over just like someone with no mask on.
It's only a "dick move" if anyone else actually cares, Zvi's analysis mid 2022 said it would almost never matter, and if it would the other person will tell you.