Real-world data show that filters clean Covid-causing virus from air • Hacker News Board

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

#21

Post by b1gz1m » Sat, Oct 09, 2021, 6:00 PM UTC

Trump 2024!

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Trump 2024!

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

#22

Post by dragontamer » Sat, Oct 09, 2021, 6:02 PM UTC

weaksauce wrote: post #16

dragontamer wrote: post #10

Earlier quoted context omitted.

> which is one of many coronaviruses. There's only like 7 coronaviruses that have been discovered to infect a human. Three of which are SARS, MERS, and COVID19. Its pretty novel, all else considered.

I mean you are dropping the whole colds are coronaviruses too part though. though, the "cold" has a bunch of possible viruses that cause it (something like 200 different viruses) with the rhinovirus being one of the larger ways since it's so resistant to being inactivated comparatively to sars2 which only lasts for a day to three as a fomite vector, is neutralized by soap and water or 70% IPA. If covid had a viral ve…

> I mean you are dropping the whole colds are coronaviruses too part though.

There's only 4 coronaviruses that causes a cold: HCoV-OC43, HCoV-HKU1, HCoV-229E, and HCoV-NL63

The rest are rhinoviruses.

-------

That's literally only 7 coronaviruses to care about (including the 4 that cause "common cold").

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

#23

Post by bsilvereagle » Sat, Oct 09, 2021, 6:11 PM UTC

dragontamer wrote: post #19

throwaway984393 wrote: post #15

You can build your own high-flow HEPA filter for about $45: 1x 20-inch box fan ($20) 1x 20x20 MERV-13+ MPR-2400+ HVAC air filter ($20) 1x roll of duct tape ($2.50) Air particle meters and other testing show they work just as well as big expensive machines (it's just the filter doing all the work). This is indeed a dirt cheap way to improve overall health.

> 1x 20x20 MERV-13+ MPR-2400+ HVAC air filter ($20) That's a MERV-13 filter, not a HEPA filter. HEPA filters 99%+ of small (0.3um) particles per pass. A MERV-13 filter only filters like 60% per pass IIRC. That means that a 1000 cu. feet of air through the HEPA filter will result in 990+ cu. feet of clean air. While the MERV-13 filter will only produce 600 cu. feet of clean air. -------- A MERV13 filter would be good…

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/

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

#24

Post by jpe90 » Sat, Oct 09, 2021, 6:18 PM UTC

throwawayboise wrote: post #6

Not surprising? HEPA filters have been known to be able to filter viruses for some time; it's maybe the main reason they were invented? Not sure about that though.

It's not surprising if you understand how HEPA filters work, the particulate sizes that they're effective for, and the particulate sizes of viruses. Most people are not familiar with one or more of those things, so these stories are worth amplifying to the end of the earth and back, so that we can be better prepared to deal with this pandemic and the next.

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

#25

Post by roughly » Sat, Oct 09, 2021, 6:20 PM UTC

auslegung wrote: post #20

throwawayboise wrote: post #6

Not surprising? HEPA filters have been known to be able to filter viruses for some time; it's maybe the main reason they were invented? Not sure about that though.

I have believed this for about a year, based on things I was reading at that time. I thought this was widely known because as you point out, that’s kinda their purpose. This article acknowledges that it was shown to be effective in lab settings and this is mainly about seeing those results in real life settings. But come on, if anyone finds something that’s probably effective based on science and isn’t going to negat…

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.

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

#26

Post by whiddershins » Sat, Oct 09, 2021, 6:21 PM UTC

Obviously.

So what would’ve happened if we had created a zillion jobs installing air filtration to create healthier workplaces across many dimensions (not just Covid) instead of paying people to stay home?

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

#27

Post by smiley1437 » Sat, Oct 09, 2021, 6:23 PM UTC

whiddershins wrote: post #26

Obviously. So what would’ve happened if we had created a zillion jobs installing air filtration to create healthier workplaces across many dimensions (not just Covid) instead of paying people to stay home?

Do you have a time machine to bring this bit of information back in time?

And, would anyone have believed you?

Many things are obvious in hindsight.

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

#28

Post by dmix » Sat, Oct 09, 2021, 6:24 PM UTC

> “This study suggests that HEPA air cleaners, which remain little-used in Canadian hospitals,

What, they are "little used"? I'd assume that's the first place that would have adopted them. So strange how some hospitals operate.

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

#29

Post by AreYouSirius » Sat, Oct 09, 2021, 6:27 PM UTC

whiddershins wrote: post #26

Obviously. So what would’ve happened if we had created a zillion jobs installing air filtration to create healthier workplaces across many dimensions (not just Covid) instead of paying people to stay home?

WRONG !

You are force to think this way !

BUT

What if you asked hospital staff if those ventilation unit in ICUs do have filter inside or they just recycle indoor infected hospital air and just add clean oxygen ???

so basically if you get into hospital and they hook you up onto ventilation unit, you will increase virus load inside your lungs because all those viruses you exhale are not filtered and you will inhale them later.

So just imagine how much is ventilation hookup in hospital good and how much is bad for you !!!

not talking about HVAC, im talking about medical equipment directly pumping hospital air into your lungs.

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

#30

Post by AreYouSirius » Sat, Oct 09, 2021, 6:29 PM UTC

smiley1437 wrote: post #27

whiddershins wrote: post #26

Obviously. So what would’ve happened if we had created a zillion jobs installing air filtration to create healthier workplaces across many dimensions (not just Covid) instead of paying people to stay home?

Do you have a time machine to bring this bit of information back in time? And, would anyone have believed you? Many things are obvious in hindsight.

no hindsight needed, why are all those millions of people wearing masks ? because WE ALL know filtration WORKS.