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Corsi-Rosenthal Foundation (US) @crfoundationus.bsky.social · 22/05/2026

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

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Corsi-Rosenthal Foundation (US) @crfoundationus.bsky.social · 18/05/2026

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

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Corsi-Rosenthal Foundation (US) @crfoundationus.bsky.social · 14/05/2026

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/

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Corsi-Rosenthal Foundation (US) @crfoundationus.bsky.social · 12/02/2026

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/

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Corsi-Rosenthal Foundation (US) @crfoundationus.bsky.social · 10/02/2026

Details for the curious-minded: 20X30X8 room. 22 people in the room. 3 CR boxes running. PM2.5 drops from 181 to 3, in 9 minutes.

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Corsi-Rosenthal Foundation (US) @crfoundationus.bsky.social · 10/02/2026

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.

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Reposted by Corsi-Rosenthal Foundation (US)

Richard Corsi @corsiaq.bsky.social · 07/02/2026

Liam is amazing. So pleased that the @crfoundationus.bsky.social was able to support his efforts.

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Corsi-Rosenthal Foundation (US) @crfoundationus.bsky.social · 06/02/2026

Great explanation of airborne viruses. CR Boxes can help remove most of these viruses from the air.

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Corsi-Rosenthal Foundation (US) @crfoundationus.bsky.social · 29/01/2026

Thank you! Glad it brought you a moment of peace.

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Corsi-Rosenthal Foundation (US) @crfoundationus.bsky.social · 26/01/2026

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/

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Corsi-Rosenthal Foundation (US) @crfoundationus.bsky.social · 16/01/2026

Within the last week we received over a dozen grant applications from schools with poor indoor air quality. We need your help to be able to say YES! Please donate today: corsirosenthalfoundation.org/donate/

corsirosenthalfoundation.org

Donate - Corsi-Rosenthal Foundation

Dedicated to providing cleaner safer air for all.

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Corsi-Rosenthal Foundation (US) @crfoundationus.bsky.social · 16/01/2026

Liam delivered all the boxes to the teachers at the STEM school. They were thrilled to have them, and to teach about clean air. From start to finish, it has been a thrilling project. At the Corsi-Rosenthal Foundation we get to be a part of projects like this all the time. You can too!

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Corsi-Rosenthal Foundation (US) @crfoundationus.bsky.social · 16/01/2026

Liam reached out to the superintendent. She was thrilled with the idea. Liam completed a grant application with us. We were thrilled with the idea. Liam worked with his scout troop to build all the boxes. They were thrilled to contribute.

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Corsi-Rosenthal Foundation (US) @crfoundationus.bsky.social · 16/01/2026

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.

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Corsi-Rosenthal Foundation (US) @crfoundationus.bsky.social · 09/01/2026

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-...

imperialvalleyweekly.com

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

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Reposted by Corsi-Rosenthal Foundation (US)

liseabetta.bsky.social @liseabetta.bsky.social · 06/01/2026

#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

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Corsi-Rosenthal Foundation (US) @crfoundationus.bsky.social · 06/01/2026

🥹🥹🥹 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...

youtube.com

UConn Air Quality Initiative

YouTube video by SpiveyCPS

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liseabetta.bsky.social @liseabetta.bsky.social · 02/01/2026

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.

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Reposted by Corsi-Rosenthal Foundation (US)

Richard Corsi @corsiaq.bsky.social · 02/01/2026

The @crfoundationus.bsky.social extends its warmest wishes for peace, joy, and healthy indoor air in 2026!

A DIY air cleaner sits on a table top next to a bottled water. The air cleaner has new white pleated filters and is assembled with blue duct tape.

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Corsi-Rosenthal Foundation (US) @crfoundationus.bsky.social · 31/12/2025

🌟None of this would have been possible without your financial support, and your efforts to spread the word that clean indoor air matters. We have big plans for 2026, and we need your support. Please donate today to help us start 2026 strong: givebutter.com/buildabox2025

givebutter.com

Build a Box Campaign

Help Us Bring Clean Air to More Classrooms

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Corsi-Rosenthal Foundation (US) @crfoundationus.bsky.social · 31/12/2025

🌟We closed out 2025 kicking off a major project in the southeastern U.S. involving three schools. We installed over 100 IAQ monitors, and led staff and students to build even more CR boxes. We look forward to seeing the impact CR boxes have on many variables we're tracking.

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Corsi-Rosenthal Foundation (US) @crfoundationus.bsky.social · 31/12/2025

🌟In September we participated in the Healthy Indoor Air: A Global Call to Action event at the United Nations in NYC. We led a demonstration on how to build a CR box and connected with many fellow IAQ advocates and leaders.

IAQ advocate Violet Affleck and CR Foundation Executive Director Liesl McConchie.

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Corsi-Rosenthal Foundation (US) @crfoundationus.bsky.social · 31/12/2025

🌟In August we partnered with Healthy Buildings 2025 in India, providing resources for attendees to build CR boxes. The event sparked interest in young and old alike to take steps to ensure cleaner indoor air.

Youth inspired to make their own modified CR box in India.

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Corsi-Rosenthal Foundation (US) @crfoundationus.bsky.social · 31/12/2025

🌟Throughout the year we provided supplies for several hundred more CR boxes to be built for schools, shelters, community centers, heat shelters, and more. Passionate volunteers built them all and put them where they were needed most.

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Corsi-Rosenthal Foundation (US) @crfoundationus.bsky.social · 31/12/2025

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.

hundreds of CR boxes lined up ready to be transported to LA fire victims.

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our lady of the cow parsley @ladycowparsley.bsky.social · 21/12/2025

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

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Reposted by Corsi-Rosenthal Foundation (US)

liseabetta.bsky.social @liseabetta.bsky.social · 27/12/2025

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

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Reposted by Corsi-Rosenthal Foundation (US)

Richard Corsi @corsiaq.bsky.social · 28/12/2025

Excellent - A friend gave me a metal Yeti drink cup inscribed with instructions on how to make a CR Box. 😊 @crfoundationus.bsky.social

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Corsi-Rosenthal Foundation (US) @crfoundationus.bsky.social · 13/12/2025

The daughter was preparing to participate in her school's science exhibition. She choose to build a mini air cleaner to remove microplastics (based on what she had learned about CR boxes) out of a lunch box. Inspiring the younger generation to clean the air is meaningful work.

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Corsi-Rosenthal Foundation (US) @crfoundationus.bsky.social · 13/12/2025

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 ...

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Corsi-Rosenthal Foundation (US) @crfoundationus.bsky.social · 09/12/2025

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

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Corsi-Rosenthal Foundation (US) @crfoundationus.bsky.social · 02/12/2025

$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

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Corsi-Rosenthal Foundation (US) @crfoundationus.bsky.social · 26/11/2025

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

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Reposted by Corsi-Rosenthal Foundation (US)

Tania J. Spencer @taniaspencer.bsky.social · 17/11/2025

What a sweet memory from 2023! ❤️ @crfoundationus.bsky.social corsirosenthalfoundation.org/showcase/pro...

corsirosenthalfoundation.org

Corsi-Rosenthal Box

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Corsi-Rosenthal Foundation (US) @crfoundationus.bsky.social · 16/11/2025

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

givebutter.com

Build a Box Campaign

Help Us Bring Clean Air to More Classrooms

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Corsi-Rosenthal Foundation (US) @crfoundationus.bsky.social · 13/11/2025

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

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Corsi-Rosenthal Foundation (US) @crfoundationus.bsky.social · 05/11/2025

🥹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

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Corsi-Rosenthal Foundation (US) @crfoundationus.bsky.social · 30/10/2025

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?⤵️

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Reposted by Corsi-Rosenthal Foundation (US)

Richard Corsi @corsiaq.bsky.social · 30/10/2025

Please post a photo of your Corsi-Rosenthal Box if you are decorating one or more for Halloween. @crfoundationus.bsky.social

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Brooke @brooklynmarie.bsky.social · 26/10/2025

Please help out the Corsi-Rosenthal Foundation, it's already done so much good in the world!!

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Ginny @ginflo2.bsky.social · 23/10/2025

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

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Corsi-Rosenthal Foundation (US) @crfoundationus.bsky.social · 25/10/2025

Check out these adorable CR box earrings made by an 8yo. Such creativity. The young ones continue to inspire us, and motivate us to do better to protect them.

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Corsi-Rosenthal Foundation (US) @crfoundationus.bsky.social · 23/10/2025

Many 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

givebutter.com

Build a Box Campaign

Help Us Bring Clean Air to More Classrooms

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Corsi-Rosenthal Foundation (US) @crfoundationus.bsky.social · 22/10/2025

This week's top fan is a soon-to-be Eagle Scout who has decided to do his big Eagle Project on building and donating CR Boxes to a local school with data showing poor indoor air quality. The youth are fired up about IAQ. And we are here for it!

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Reposted by Corsi-Rosenthal Foundation (US)

Matt Siegel @mattsiegel.bsky.social · 09/10/2025

directions for filtering indoor air

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Corsi-Rosenthal Foundation (US) @crfoundationus.bsky.social · 10/10/2025

Research says ... CR boxes are: - effective - quiet - durable - easy to move - not a distraction to teachers or students If you want to get CR Boxes into your classroom, the CR Foundation can give you all the supplies ... for FREE. Apply for a grant today: corsirosenthalfoundation.org/apply/

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Corsi-Rosenthal Foundation (US) @crfoundationus.bsky.social · 09/10/2025

You can access these charts on our website, here: corsirosenthalfoundation.org/apply/ Click on Step 1: Identify the need for Corsi-Rosenthal Boxes and you'll see the same charts. (as always, not medical advice. Chart estimates ceiling height of 9ft.)

corsirosenthalfoundation.org

Apply - Corsi-Rosenthal Foundation

Dedicated to providing cleaner safer air for all.

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Corsi-Rosenthal Foundation (US) @crfoundationus.bsky.social · 09/10/2025

How many CR Boxes do you need for a particular space? Check out our new handy charts to help gauge your needs for: - school settings - residential settings *Notice the guidance is different based on your goals: - mitigating wildfire smoke - mitigating bioaerosols

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