APRIL RECAP 🌟 67 CR boxes granted to help provide cleaner air to schools and community spaces. That’s clean air for approximately 6,800 children & community members! Please DONATE to help us continue: https:// corsirosenthalfoundation.org/donate
Corsi-Rosenthal Foundation (US)
@crfoundationus.bsky.social
Improving human health by promoting clean indoor air and supplying air purifiers to those in need. https://corsirosenthalfoundation.org/
MARCH RECAP 🩵 59 CR boxes granted to help provide cleaner air to schools and community spaces. That's clean air for approximately 235 children & community members! 🙌 Please DONATE to help us continue: https:// corsirosenthalfoundation.org/donate
FEBRUARY RECAP 21 CR boxes granted to help provide cleaner air to schools and community spaces. That’s clean air for approximately 750 children & community members! 🩵 Please DONATE to help us continue: corsirosenthalfoundation.org/donate/
LEFT: 2024 Grant recipients RIGHT: 2025 Grant recipients Last year was a tremendous year of impact for us at the CR Foundation. Check out our full report of 2025 activity: corsirosenthalfoundation.org/about/
We don't have any orange smoke, but we do have a particle counter. Watch these PM2.5 levels plummet in this time-lapse video of running CR boxes for 9 min.
Liam is amazing. So pleased that the @crfoundationus.bsky.social was able to support his efforts.
Corsi-Rosenthal Foundation (US)@crfoundationus.bsky.social · 7mo agoLiam, a teenager in North Carolina, reached out to us at the Corsi-Rosenthal Foundation in the fall of 2025. To earn his Eagle Scout award, Liam wanted to build 30 CR Boxes for a local STEM elementary school. What a thrill it has been to watch this project blossom.
Great explanation of airborne viruses. CR Boxes can help remove most of these viruses from the air.
Durham County Department of Public Health (DCoDPH)@durhamhealthnc.bsky.social · 6mo agoAn airborne virus is a virus that can infect other people through unseen particles in the air, sometimes for hours after the sick person has left the area! Masks and clean, ventilated air can reduce the risk of getting sick from airborne viruses or infecting others.
This is the face of a teacher who is learning how easy (and fun) it is to make a Corsi-Rosenthal Box. Clean classroom air is coming their way! Join the movement: corsirosenthalfoundation.org/donate/
Liam, a teenager in North Carolina, reached out to us at the Corsi-Rosenthal Foundation in the fall of 2025. To earn his Eagle Scout award, Liam wanted to build 30 CR Boxes for a local STEM elementary school. What a thrill it has been to watch this project blossom.
Another community building CR boxes for schools! “There’s not much that we can do about the air quality outside. But being able to create our own safe haven indoors is what we can do to actually have control and autonomy over our own health.” www.imperialvalleyweekly.com/news/seeley-...
Seeley School Community Builds DIY Indoor Air Purifiers
SEELEY — In a community where air quality challenges are part of daily life, students, parents and school staff at Seeley Union School District took action this week by learning
imperialvalleyweekly.com
#Cdnpoli #USpoli DIY #CorsiRosenthalBox air filter units. Infectious disease is airborne and sits in the air like cigarette smoke. Clean your indoor air. #Flu #COVID #RSV
Corsi-Rosenthal Foundation (US)@crfoundationus.bsky.social · 7mo ago🥹🥹🥹 This 2-min video of students across Connecticut building CR boxes in schools is full of: Hope Science Encouragement All the feels Keep advocating for clean air in schools. We're here to help. Shout out to Marina Creed & team! 💪🫶 www.youtube.com/watch?v=KkC9...
🥹🥹🥹 This 2-min video of students across Connecticut building CR boxes in schools is full of: Hope Science Encouragement All the feels Keep advocating for clean air in schools. We're here to help. Shout out to Marina Creed & team! 💪🫶 www.youtube.com/watch?v=KkC9...
UConn Air Quality Initiative
YouTube video by SpiveyCPS
youtube.com
I posted the 4 filter version of a DIY CR box air filter, and a newer CR box inspired air filter with computer fans, this below is the simplest version of a CR box. It doesn't clean teh air in as large a space as the other two versions but if you need something please try this one fan/one filter.
Corsi-Rosenthal Foundation (US)@crfoundationus.bsky.social · 11mo ago“By coming together to build these purifiers, neighbors are taking a meaningful step toward ensuring that children and educators have a safer, cleaner place to learn and grow.” Read how Safe Streets Wichita used our grant process to build CR boxes. www.communityvoiceks.com/2025/08/01/d...
The @crfoundationus.bsky.social extends its warmest wishes for peace, joy, and healthy indoor air in 2026!
A few highlights from 2025, and our wish for 2026. 🌟We started off 2025 by providing over 1,100 modified CR boxes to those impacted by the LA fires. It was a massive grassroots effort with many people rolling up their sleeves to help during this crisis.
Nervous about getting together with family for the holidays? Bring the best present of all, a Corsi-Rosenthal box! Dress it up with a big red bow of course🎁 youtu.be/1aMOtwcmvpo?... @crfoundationus.bsky.social
As you can see, I posted about the original CR box here last Christmas. The advantage of the newer type CR box researched and assembled by @davidelfstrom.bsky.social is that they are quieter, which is a plus for classrooms and businesses, and repairable. You can follow @crfoundationus.bsky.social
liseabetta.bsky.social@liseabetta.bsky.social · 2y agoMy spouse and I still mask anywhere indoors that is outside of our home and we use DIY air filter boxes #corsirosenthalbox. They are easy to make and in many cases outperform brand name HEPA filters. This website is a also a great resource: cleanaircrew.org
Excellent - A friend gave me a metal Yeti drink cup inscribed with instructions on how to make a CR Box. 😊 @crfoundationus.bsky.social
An uplifting story of the far-reaching impacts of Corsi-Rosenthal boxes: The @crfoundationus.bsky.social sponsored the Healthy Buildings conference in India this year. We provided supplies to build CR boxes. One of the attendees went home & taught their daughter what he had learned ...
People all over the U.S. are coming together to provide clean indoor air for their community. Look at the wonderful folks of Imperial County, CA leading the way. Two ways to join the movement: 1⃣Apply for a grant to build 2⃣Donate: givebutter.com/buildabox2025
$4 provides clean air for 1 student for an entire year. $100 provides clean air for a classroom for a year. We are 15% of the way to our goal of raising $25,000. Please help us provide clean air for more children & teachers. DONATE: givebutter.com/buildabox2025 #GivingTuesday
Our biggest week yet!! We are thrilled to have the resources to approve 7 new grants this week, totaling 275 CR Boxes. That is clean air for approx. 10,000 kids & community members. Please DONATE to help us continue: givebutter.com/buildabox2025
Just this month, the @CRFoundationUS has received applications for 275 CR boxes to be deployed to 7 schools & community centers. That is clean air for thousands & thousands of people. Please help us meet these needs.🙏🙏 Donate now: givebutter.com/buildabox2025
Build a Box Campaign
Help Us Bring Clean Air to More Classrooms
givebutter.com
More and more people around the world are talking about the importance of clean air! Join the movement and donate today and help us reach our goal of getting clean air to 10,000 students! Donate today: givebutter.com/buildabox2025
🥹Look at our elders keeping their community healthy🥹 This is Air Alliance Houston building CR Boxes. If you are inspired by these folks, please donate so we can sponsor more events like this: givebutter.com/buildabox2025
Is your air cleaner a money suck? ⬆️up front cost ⬆️cost of replacement filters The CR box is a fraction of the cost of other units, with greater efficacy. It just moves SO much air, providing mixing and many more passes through the filters. Can your air cleaner do this?⤵️
Please post a photo of your Corsi-Rosenthal Box if you are decorating one or more for Halloween. @crfoundationus.bsky.social
Please help out the Corsi-Rosenthal Foundation, it's already done so much good in the world!!
Richard Corsi@corsiaq.bsky.social · 9mo agoIn our short existence, The Corsi-Rosenthal Foundation has issued 58 grants providing healthier indoor air to 30,000 ppl. The Foundation aims to substantially increase these benefits to under-resourced schools over the next several months. Please consider helping us: givebutter.com/buildabox2025
Please consider donating. As we know this is an indoor pandemic and to give our kids the best chance is to clean the air in the schools using air filters if their IAQ is subpar(which most are 🥺) I have built countless Corsi boxes over these past 5 yrs and they have kept us safer! #CleanTheAirWeShare
Corsi-Rosenthal Foundation (US)@crfoundationus.bsky.social · 10mo agoMany of you have been with us from the beginning, as champions for clean air. We have put thousands of CR boxes into schools & community spaces across the country. Help us continue the movement making clean air accessible to all by donating today: givebutter.com/buildabox2025