Do Corsi-Rosenthal Boxes Work?
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- čas přidán 19. 04. 2022
- Do Corsi-Rosenthal Boxes Work?
This is an excerpt from my full interview with Linsey Marr :
• Is the Virus in the Ai...
"The Corsi-Rosenthal Box, also called a Corsi-Rosenthal Cube or a Comparetto Cube, is a design for a do-it-yourself air purifier that can be built comparatively inexpensively. It was designed during the COVID-19 pandemic with the goal of reducing the levels of airborne viral particles in indoor settings." (Wikipedia)
Designed by environmental engineer Richard Corsi and Jim Rosenthal, the CEO of filter manufacturer Tex-Air Filters, it's easy to find simple plans online to build one for $50-150, using a regular box fan.
But do they actually work? How effective are they?
I asked another environmental engineer Linsey Marr, one of a handful of experts in how viruses move in the air and through our indoor and outdoor environments.
Dr. Marr is an environmental engineer at Virginia Tech where she’s been studying the movements of various particles and aerosols in the air, including flu viruses, for many years. With the Covid-19 pandemic her lab turned its attentions to the coronavirus and for two years she’s been consistently warning us that the coronavirus is airborne and that we need to focus our efforts on the appropriate measures.
You can find out more about Linsey Marr at
/ linseymarr
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Find Logan at www.loganwhitehurst.com and also visit his artist page on Spotify:
open.spotify.com/artist/7EVSr... - Věda a technologie
I made one of these and it’s made a noticeable improvement in my air quality. With the upcoming fire season, I’m looking forward to putting this filtration system to the test.
That's so cool! How much did it cost?
I made one just a month or two ago for my parents. Four filtrete 1900 (MERV 13) 20x20x1 at the blue box store gets a bulk discount and came in at just under $80 with tax. A 15" Lasko and a roll of duct tape from wally world was just over $20 with tax. There's enough tape left for at least one more rebuild, so replacing the filters next time will only incur the filters cost itself.
I get at least 18-24 mos running mine with 4ea 20x30x1 + 1ea 20x20x1 on the bottom running 24x7, but it's just me & a smallish dog. I do run a vacuum hose over the filters a couple times a yr to pull off the larger stuff (mostly hair and leaves) that collects near the floor thanks to the pupper.
This design has been in use for decades. The two nutty-professors from UC Davis have co-opted it as their own. It's like someone claiming to have invented putting a rubberband around a deck of cards.
You mean the "DR-cm4hi Deck"?
😉
It’s called the Awesomes007-Band.
been using a box fan with a filter taped to the from in the bedroom for 40 years ago, they are excellent for allergies and the white noise they provide are great for tinitus issues.
These were popular in woodshops in the 90s.
I thought it was merv 13 cant find merv 14 anywhere
Of course these work, the've been used for decades. These DIY filter boxes just didn't have a fancy name till recently.
I’ve been planning on building one of these for a while for pet dander. I was thinking of adding a UV light to inside to kill bacteria. Haven’t seen anyone doing that though so curious to know of effective it might be.
I don’t know but I think one factor would be how long the air inside is exposed to the UV light. And also is the UV light the proper frequency to actually kill anything.
Do you know how long you can use them before the filters need to be replaced?
Good question! I don't know - but I suspect the filters themselves have that information on them.
@@sciencecomedian thank you!
At least a year or two. These filters generally have to be changed each year on HVAC equipment. You have four of them in this system. Some people have used the same filters for two, three years. Obviously depends on how dirty your air is. Have a dozen cats? Smoker? you get the idea ;-) I would honestly use two filters (1 inch each thick each) and have the MERV 8 or so filters on the outside and the MERV 13 + filters on the inside for a total of eight filters. The MERV 8 would be a pre-filter.
@@jamesvelvet3612 thank you!
they'll turn black
whats the CFM on it?
I would calculate with half of what the fan actually had without filters. So I guess a rough estimate of the loss of air flow is 50% which is pretty good.
3D print the frame for the filters n fan to rest on boom! sell them #thankmelater
3:04
What people don't know about air filters is that even the best will only filter out less than 10% of the particles in air. Over 90% of the particles in the air are "ultra fine" particles in the range of 0.1 microns to 0.003 microns and even smaller, and these are the ones that can do the most harm to us, being small enough to enter our blood stream. The fact is an air filter that can filter out these ultra-fine particles has not even been invented yet. All these air filter technologies we have today are historically centered around removing "dust" particles.
1) NO! A CR Box does NOT perform better than a good HEPA air purifier. It will be able to beat some air purifiers, for sure, (esp. at filtering larger particles) as 99% of the HEPA air purifiers don't actually filter at a HEPA level. But it will NOT filter better than the upper-echelon solutions like IQAir, Airpura, etc.
2) It doesn't have any carbon so it will be less effective for chemicals/VOCs than units with a good amount of carbon.
3) It IS good for filtering larger particles. And it will help take out larger particles in the air but the smaller particles are the most dangerous to humans and the most plentiful in the air (ultrafine particles = 90% of the particles in our air and they are .1 to .003 microns in size).
4) NASA, Hospitals, Airplanes and on and on and on use HEPA filtration for superior air quality NOT MERV 12,13,14 filters...
5) The CDC recently said, "DIY air filtration units may be effective for temporary use until commercial portable air cleaners with known performance characteristics can be acquired, or used in areas that cannot obtain commercial portable air cleaners. However, the EPA does not recommend the DIY units as a permanent alternative to products of known performance (such as commercially available portable air cleaners)."
6) CR Boxes are better than nothing and they definitely do improve the quality of air in your space esp. for larger particles - but they do not filter better than the upper echelon HEPA solutions on the market.
Al Gore invented the internet 😂😂
Yep, it's made of tubes.
Even better: open the windows.
What large egos to name taping filters together after yourself....what a fragile ego
😅😅😅