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Yes – it removes aerosols from the air. How well does it work? Very well.
Dr. Marwa Zaatari, Chief Science Officer at Blue Box Air & ASHRAE Associate Member
“It is the most cost effective purifier on the chart.” – this evaluation is from Dr. Zaatari, who regularly publishes an easy-to-understand chart that simplifies the often complex air clean marketplace. It should be noted that this was the single filter version – so the 2/ 4/ 5 filter versions should perform even better.
One large caveat – this is with the shroud on the fan.
UCDavis Western Cooling Efficiency Center found it delivers an equivalent performance to commercial air cleaners that cost 3x as much.
<blockquote class="twitter-tweet"><p lang="en" dir="ltr">Check out our new testing on DIY portable air cleaners. We found that the <a href="https://twitter.com/CorsIAQ?ref_src=twsrc%5Etfw">@CorsIAQ</a>/ <a href="https://twitter.com/JimRosenthal4?ref_src=twsrc%5Etfw">@JimRosenthal4</a> Box performs similarly to residential portable air cleaners in terms of estimated clean air delivered & costs about 3x less. <a href="https://t.co/i0jvLPhkSF">https://t.co/i0jvLPhkSF</a> <a href="https://twitter.com/UCDavisCOE?ref_src=twsrc%5Etfw">@UCDavisCOE</a> <a href="https://twitter.com/ucdavis?ref_src=twsrc%5Etfw">@ucdavis</a> <a href="https://t.co/RC04VPi0Lj">pic.twitter.com/RC04VPi0Lj</a></p>— UC Davis Energy (@ucdavisenergy) <a href="https://twitter.com/ucdavisenergy/status/1432774552745091079?ref_src=twsrc%5Etfw">August 31, 2021</a></blockquote> <script async src="https://platform.twitter.com/widgets.js" charset="utf-8"></script>And here is the final brochure/ PDF documenting all of their work.
CBC Business Marketplace evaluated a MERV 11 single filter version of the Corsi/Rosenthal Box
The $70 single filter MERV 11 version easily outperformed the $800 Dyson Pure Hot & Cool. Even more impressively, this was with NO shroud which increases performance by 47%, and a MERV 11 filter instead of a MERV 13 filter.
The Built Environment Research Group at the Illinois Institute of Technology found these excellent results for the 4 Filter version of the Corsi/Rosenthal Box
“… (T)he Built Environment Research Group has been independently evaluating the efficacy and potential for adverse consequences…” And they evaluated this version in September 2021.
<blockquote class="twitter-tweet"><p lang="ro" dir="ltr">We tested a version of a Corsi-Rosenthal box with MERV 13 filters: <a href="https://t.co/zxBwCGsD6l">https://t.co/zxBwCGsD6l</a><br>CADR intuitively increased with particle size:<br>166 CFM for 0.09-1 µm<br>321 CFM for 0.5-3 µm<br>464 CFM for 5-11 µm<br>More air cleaner testing here: <a href="https://t.co/ONJkSXxAra">https://t.co/ONJkSXxAra</a><a href="https://twitter.com/JimRosenthal4?ref_src=twsrc%5Etfw">@JimRosenthal4</a> <a href="https://twitter.com/CorsIAQ?ref_src=twsrc%5Etfw">@CorsIAQ</a></p>— BERG@IIT (@built_envi) <a href="https://twitter.com/built_envi/status/1435328519471501320?ref_src=twsrc%5Etfw">September 7, 2021</a></blockquote> <script async src="https://platform.twitter.com/widgets.js" charset="utf-8"></script>Why does it work so well?
Jim Rosenthal, past president of the National Air Filtration Association and chief executive officer of Tex-Air Filters, discusses why the Corsi/Rosenthal Box works so well. It’s a fascinating article, but if you have no time:
- The sheer amount of air flow from the CR Box is about 700 CFM (on only medium speed) versus the $900 HEPA filter it was compared with (300 CFM on maximum).
- It must be emphasized that Jim Rosenthal called for further research into this.
- Here’s a graph of how it performed:
- Yes – at least as good as a $900 HEPA filter.
- Though to be crystal clear, the CADR for the MERV 13 filters is still being measured.
- Above is with MERV 11 filters. The one you will make will have MERV 13 filters, so should be better.
Dr. Richard Corsi discusses the Corsi/Rosenthal Box
In this NPR Article, Dr. Corsi reported, “”People are now reporting 600 cubic feet per minute in clean air delivery rates. That’s phenomenal. That’s better than a lot of the more expensive HEPA-based portable air cleaners,”
Speaking of Dr. Corsi – in this video he discusses the benefits of the Corsi/Rosenthal Box.
This is anecdotal – and you have to have masking as well as air cleaning!
<blockquote class="twitter-tweet" data-conversation="none">
<p dir="ltr" lang="en">We built 18 of these for a small school here in East Rochester. Classes have been going 5 days a week all school year without any outbreaks! <a href="https://t.co/sp4dWWOOSj">pic.twitter.com/sp4dWWOOSj</a></p>
— Matthew Bowers (@ROCPassiveHouse) <a href="https://twitter.com/ROCPassiveHouse/status/1371863229144690688?ref_src=twsrc%5Etfw">March 16, 2021</a></blockquote>
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