Posted on 08/24/2022 7:41:08 PM PDT by ConservativeMind
Public health experts are touting ventilation as a less-intrusive way to stop tiny particles carrying the virus from traveling through the air. But uptake of better practices has been slow.
Enter the Corsi-Rosenthal Box, a do-it-yourself air filtration system that has taken the internet by storm. Each box typically costs under $100 to make and is more effective than other, pricier options like High Efficiency Particulate Air filters.
The simple contraption consists of a box fan, four MERV13 furnace filters that can be purchased online or in store, some cardboard and strips of tape. It’s the brainchild of air quality researcher Richard Corsi and Jim Rosenthal.
“How do we build something that might still be pretty effective at a much lower cost?” Corsi said. “And it was just kind of sketching something out and realizing that just $20 box fans produce much higher flow rates than the fans that are in HEPA air filters.”
Portable air filters can make up for outdated ventilation systems, although they come with hefty price tags. Standalone devices that use HEPA filters can cost upwards of $300 to $400, and that doesn’t include the price of filter replacements.
With MERV13 filters making up each side of the cube, the box fan on top pulls air through the filters and blows clean air out of the top. In a 700-square-foot classroom with nine-foot ceilings, a Corsi-Rosenthal Box on the highest fan setting can add the equivalent of about seven-and-a-half to eight air changes per hour, Corsi said.
“If we started at two air changes per hour and we added eight air changes per hour, we’re roughly getting about an 80% reduction in inhalation dose with that single Corsi-Rosenthal Box,” he said. “That’s a huge reduction. That’s like everybody wearing pretty decent masks in the classroom.”
(Excerpt) Read more at dallasnews.com ...
I’d like to read the article but it wants my money to allow access
Very interesting & clever.
It should do a good job on particulate matter. Respiratory viruses? Nah. Just another symptom of Howard Hughes Syndrome. Feed the paranoia.
The not so secret secret is even if you could remove everything in your home’s air, you don’t want to do that. You need to be exposed to things to keep your immune system robust.
You just want the air scrubbed enough to keep what you are allergic to at a tolerable level.
(There’s no aluminum foil to protect against alien thought rays!!)
Ummm, excuse me.......
The tinfoil only protects you from government satellites 🛰️ reading your thoughts.
We’re still trying to figure out how the UFO 🛸 does it.
C’mon man!!
Repeat the line.
Thank you
No mention of what you need to do when it’s time to change filters
You rip the tape off and put four new filters back on.
With all that virus trapped in the filters you’re handling
Cardboard and tape in close proximity to a hard working motor and electrical wires?
Do I smell something burning?
“Each box typically costs under $100 to make and is more effective than other, pricier options like High Efficiency Particulate Air filters....The simple contraption consists of a box fan, four MERV13 furnace filters that can be purchased online or in store, some cardboard and strips of tape.
~~~~~~~~~~~~~~~~~~~~~~~~~
I’m missing something here....
According to the EPA, a HEPA filter is defined as being “theoretically able to remove at least 99.97% of dust, pollen, mold, bacteria, and any airborne particles with a size of 0.3 microns (µm).” Meanwhile, a MERV 13 filter rating is that it has a “removal efficiency of 50% for particles in the 0.3 to 1.0 micron size.”
So I guess this claim all hinges on what the word ‘effective’ means? In the meantime, the covid19 virus particles are supposedly in the 0.1 micron size in which case, one better hope that the are always attached to something larger....
I doubt the fans bearings are made to spin horizontally. It probably would get real noisy (relative to the racket a $20 box fan normally makes).
Yes but it filters out all the “filler” so you get pure virus.
Wouldn’t be hard to modify that design so the fan sits in it’s normal position.
Disclaimer: Opinions posted on Free Republic are those of the individual posters and do not necessarily represent the opinion of Free Republic or its management. All materials posted herein are protected by copyright law and the exemption for fair use of copyrighted works.
