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Portable air filters can make up for outdated ventilation systems, although they come with hefty price tags.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 ...
Isn’t that cardboard contaminated with various thing
here’s another way to guard against diseases but it does have one weak point,
https://www.youtube.com/watch?v=kvqvOQtNQjQ
The other issues I can see is a potential fire hazard
If people don't want COVID, they can just look at the Amish. No TV - No COVID.
The fan motor is thermally protected. There is a fuse that will blow if it gets too hot. There’s also a fuse in the power cord. Both are UL requirements.
GMAFB
They just can’t give up their pandemic fantasy.
I’ll take my chances.
The only to be protected against Covid is to follow all orders from Saint Fauci
P4L
This is ridiculous. More effective than a mask?
A mask is an absurdly low standard in terms of protecting against Covid, from what we have learned.
But, by all means, make a few of these.
There’s no aluminum foil to protect against alien thought rays!! How can I take this series?
It is clever that it can be made easily without tools.
If you are handy with tools, you can make a deluxe version.
Truly filter out covid you have to pump the air through a tank of compressed fluid through a filter that is 5 microns it’s incredibly slow and very energy intensive but what comes out the other side just air bubbles floating up through the liquid on the other side but it’s pure clean air that is completely free of any contaminants I don’t think anybody’s going to put that in their house
3 wraps around the head (~6 ft) oughta do it.
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.