Real-world data show that filters clean Covid-causing virus from air

Post by Animats » Sat, Oct 09, 2021, 9:05 PM UTC

coralreef wrote: post #48

overton wrote: post #36

Earlier quoted context omitted.

Early on in the pandemic, the Canadian IPAC (Infection Control and Prevention) establishment came down hard against theories of airborne COVID transmission, at first even going so far as to not recommend masking. Even now that the science of airborne transmission has been established, they're waging a rearguard battle to obfuscate/deny it and airborne protections such as better ventilation and masking. If you go to a…

> If you go to a Canadian hospital wearing an N95 these days there's a good chance they will insist you to take it off in favour of a "clean" surgical mask with gaps around the sides and nose. Wouldn't that just be because of protocol, ie. they don't know if you, a member of the public, actually have a legit N95 mask, or if you know how to correctly implement it, etc.

Post by hammock » Sat, Oct 09, 2021, 9:10 PM UTC

dragontamer wrote: post #42

bsilvereagle wrote: post #23

Earlier quoted context omitted.

It’s worth noting that filter efficiency is a function of particulate size. A MERV13 and a HEPA filter are nearly equivalent for filtering pollen, but have drastically different performance for smoke and virus particles. There’s a plot 1/3 of the way down the page that shows the curves: https://frdmtoplay.com/nagivating-air-purification/

Yeah, it's actually pretty complicated. MERV13 also needs less pressure, and a box fan is bad with pressure. If you stuck a HEPA filter on a box fan, it might only do 100cu feet of airflow. MERV13 is maybe 200. HEPA is designed for higher pressure centrifugal fans. MERV13 is likely the best balance for home made designs

Post by felipellrocha » Sat, Oct 09, 2021, 9:11 PM UTC

nprz wrote: post #74

Someone made an interesting point that we got rid of cholera by drinking cleaner water and that we'll get rid of Covid by breathing cleaner air.

Post by henrikschroder » Sat, Oct 09, 2021, 9:15 PM UTC

seventytwo wrote: post #80

roughly wrote: post #25

Earlier quoted context omitted.

With the added bonus that it would be better for the students’ health generally and would likely improve overall educational outcomes. An awful lot of our handling of COVID has been farcical (a year and a half in, we’re still relying on cloth masks and obsessively sanitizing surfaces), but in the case of schools it’s veered toward absurdist/tragic.

The authorities have long since stopped recommending cloth masks and surface cleaning. Anyone still applying or recommending those methods isn’t up to date. There’s nothing farcical about recommending cloth masks and surface cleaning during the first few months of the pandemic when nothing was known about how the virus spread and when masks needed to be reserved for those on the front lines. The only farcical piece i…

Post by seventytwo » Sat, Oct 09, 2021, 9:26 PM UTC

henrikschroder wrote: post #87

seventytwo wrote: post #80

Earlier quoted context omitted.

The authorities have long since stopped recommending cloth masks and surface cleaning. Anyone still applying or recommending those methods isn’t up to date. There’s nothing farcical about recommending cloth masks and surface cleaning during the first few months of the pandemic when nothing was known about how the virus spread and when masks needed to be reserved for those on the front lines. The only farcical piece i…

> The authorities have long since stopped recommending cloth masks That depends completely on where you live, there are plenty of places that still have indoor or outdoor mask mandates, despite them being completely useless.