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jimrosenthal5.bsky.social @jimrosenthal5.bsky.social · 10d

Yes, these are relatively large particles. Your CR box will easily filter out any airborne pastel dust.

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jimrosenthal5.bsky.social @jimrosenthal5.bsky.social · 10d

Many thanks for the support. Many students will benefit from your generosity!

Smart Air UK @smartairuk.bsky.social · 10d

📣We’re thrilled to announce that starting today, for one month, for every ten SA600 units sold in the UK, we’ll donate one SA600 in kind to the @crboxfoundationuk.bsky.social

Help us make a difference in the fight for #CleanAirForKids.

Learn more: bit.ly/47aYgf9

#CleanAir

Smart Air UK x The Corsi-Rosenthal Foundation UK - Smart Air UK

For the next month starting 1st October, every time ten SA600 air cleaners are sold in the UK, we will donate one SA600 in kind to The Corsi-Rosenthal Foundation UK.

bit.ly

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OrdinaryMind 🪞 @rest108.bsky.social · 16d

Easy, inexpensive ( at largely under $100) and certified effective by 3M, others, for the last five years. CR boxes used in schools and universities across the country and around the world, thanks to co-inventors @corsiaq.bsky.social and @jimrosenthal5.bsky.social

youtu.be/hIuH-2naozI?...

How to Build a Corsi-Rosenthal Box

YouTube video by UC Davis College of Engineering

youtu.be

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jimrosenthal5.bsky.social @jimrosenthal5.bsky.social · Sep 5

Agreed the standardized tests are a very valuable to assess additive air cleaners. The choice to use a picture of a CR Box - an air cleaner that removes contaminates - is unfortunate.

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jimrosenthal5.bsky.social @jimrosenthal5.bsky.social · Sep 2

Really excellent work! This test should be required for all air cleaners that produce chemical byproducts! (CR Boxes do not,)

Dustin Poppendieck @poppendieck.bsky.social · Sep 2

It took 4.5 years.

Presenting a robust, consensus test standard to examine if portable air cleaners produce chemical byproducts (ozone, formaldehyde, UFP):

ASTM D8625: Standard Test Method for Chemical Assessment of Air Cleaning Technologies tinyurl.com/25pyaayf

www.nist.gov/news-events/...

Some Air Cleaners Release Harmful By-Products. Now We Have a Way to Measure Them.

Many types of air cleaners can generate small amounts of air pollution. Until now, there was no standard way to measure these negative by-products

www.nist.gov

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Richard Corsi @corsiaq.bsky.social · Aug 31

Glad it helped you and the cats!

Esotouric's Secret Los Angeles @esotouric.bsky.social · Jan 8

The Corsi-Rosenthal Box we built out of fans, filters and duct tape is amazing. Removed smoke stench within minutes, making it safer to breathe for us and the cats. Everybody in wildfire country needs one of these air purifiers. corsirosenthalfoundation.org/instructions/ #palisadesfire #EatonFire

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Richard Corsi @corsiaq.bsky.social · Aug 27

Check out the USEPA's newest air cleaning allies activity book for children. DJ is definitely the coolest (and with additional filters in parallel - a more effective ally than Aerie).👇

www.epa.gov/system/files...

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Dustin Poppendieck @poppendieck.bsky.social · Aug 26

This is great. An EPA activity book for elementary school kids on air cleaning:

www.epa.gov/system/files...

www.epa.gov

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jimrosenthal5.bsky.social @jimrosenthal5.bsky.social · Aug 24

Excellent study showing how bringing in filtered outside air improves asthma outcomes. This is important information and needs to be part of every residential HVAC installation. Build tight - but with filtered ventlation1

doi.org/10.1016/j.bu...

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Corsi-Rosenthal Foundation (US) @crfoundationus.bsky.social · Jul 16

Another great week of helping folks access cleaner indoor air.

Be sure to follow us and RT.

We've got A LOT of new resources to share in preparation for back-to-school season.
@corsiaq.bsky.social @polsiewski.bsky.social @jimrosenthal5.bsky.social @jaydocovid.bsky.social @jehnml.bsky.social

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jimrosenthal5.bsky.social @jimrosenthal5.bsky.social · Jul 9

The same type of charlatans are active in the indoor air world. There are plenty of cures for the air very few of which work, but the theory is the same costly non-effective and and wasting time.

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jimrosenthal5.bsky.social @jimrosenthal5.bsky.social · Jun 15

My Father’s Day card from my wife.

I was one of the original “Weber Demo Guys.”

A few years ago my wife asked me to retire my Weber grill (too much smoke). So not only am I not a “King” - I don’t have a grill. (Sounds familiar.)

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jimrosenthal5.bsky.social @jimrosenthal5.bsky.social · Jun 10

Wildfire smoke is covering large areas of the US. Time to make a Corsi-Rosenthal Box. They work!
www.spokesman.com/stories/2025...

These DIY air purifiers could make clean air more accessible during wildfires

As wildfires rage across the country, smoke plumes from scorched structures pose a major health threat. Sneaky particles can creep through vents and other home openings, but buying high-quality HEPA f...

www.spokesman.com

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jimrosenthal5.bsky.social @jimrosenthal5.bsky.social · May 29

Very interesting article on the University of Utah program to monitor and modify indoor air for better IAQ. This data can drive decisions on filters, equipment and operations. It is the wave of the future. Every large institution should be heading in this direction.
attheu.utah.edu/research/doe...

Does outdoor air pollution affect indoor air quality? It could depend on buildings’ HVAC - @theU

Using the U campus itself as a lab, researchers conclude inversion and dust pollution is kept out of buildings, but wildfire smoke can sneak inside if efficient 'air-side economizers' are in use.

attheu.utah.edu

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jimrosenthal5.bsky.social @jimrosenthal5.bsky.social · May 18

We are entering “wildfire season” in North America. This is an excellent site showing where the wildfires are located and where the wildfire smoke is headed. Be prepared! Firesmoke.ca

Home - FireSmoke.ca

Firesmoke.ca

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jimrosenthal5.bsky.social @jimrosenthal5.bsky.social · May 16

The BC Wildfire Research group did tests to develop a "clean air shelter" for firefighters. One test used a 14'X24' Ranger tent. They attached a MERV 13 CR box onto the tent - facing in. The positive pressure from the fan and the CR Box filters reduced PM 2.5 by 91%! Ingenuity triumphs again!

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jimrosenthal5.bsky.social @jimrosenthal5.bsky.social · Mar 25

I have tested MERV 13 washable filters. All have been very resistant to air flow. I would not recommend using them in CR boxes.

marshwiggle.bsky.social @marshwiggle.bsky.social · Mar 24

www.lowes.com/pd/K-N-14-in...

@corsiaq.bsky.social @jimrosenthal5.bsky.social

Are washable merv-13's real? Anything the average CR box maker should be aware of?

www.lowes.com

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jimrosenthal5.bsky.social @jimrosenthal5.bsky.social · Mar 25

Excellent article on the effectiveness of Corsi-Rosenthal Boxes on wildfire smoke and other PM2.5 airborne contaminants:
www.washingtonpost.com/climate-solu...

These DIY air purifiers could make clean air more accessible during wildfires

Homemade air purifiers can filter air faster, making them an affordable alternative to more expensive commercial products.

www.washingtonpost.com

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jimrosenthal5.bsky.social @jimrosenthal5.bsky.social · Feb 24

Outstanding video on the success of Red Rock Elementary in building Corsi-Rosenthal Boxes. Many thanks to this great teacher and her students. Others can do the same. Just apply for a grant!

Corsi-Rosenthal Foundation (US) @crfoundationus.bsky.social · Feb 24

Hear how frequent illness and poor air quality posed major problems for students at Red Rock Elementary, and how Corsi-Rosenthal Boxes boosted their health and ability to learn.

Learn more at:
CleanAirK12.com
CorsiRosenthalFoundation.org
#CRBox #CleanAirK12

Full Video:
youtu.be/dUYLPUfkv0g

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jimrosenthal5.bsky.social @jimrosenthal5.bsky.social · Jan 16

It is pretty hard to beat the particle counter you have for price. (less than $100). I also like it because it gives the size bins by number - not just PM. It's not the most accurate, but OK for most purposes. I also use Dylos, Qingping and Air Knight. Dylos works the best for me.

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jimrosenthal5.bsky.social @jimrosenthal5.bsky.social · Jan 14

Contrary to what many believe, disasters can bring out the best in people. This is an incredible thread on how people can work together to accomplish positive things in the worst of times.

Douglas Hannah @buildit.bsky.social · Jan 14

With fires in LA still burning (but hopefully not for long), here's a thread about what we know about entrepreneurship in the wake of (and during) natural disasters 🔥

(🧵 1/15)

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Kimberly Prather PhD @kprather.bsky.social · Jan 12

Am getting inquiries on how to stay safe in terms of air LA due to fires...indoor filtration is key. Inexpensive CR boxes can be built in less than 1 hour by a 5 year old and outperform more expensive HEPAs. KN95 for particles. Respirators with activated carbon is concerned about gases/fumes. (1/2)

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Marcia Cohen Zakai @cozamarsh.bsky.social · Jan 10

TY @jimrosenthal5.bsky.social

LA County Public Health, LA County Board of Supervisors, the City of Los Angeles and every city in the region should also be distributing free N95s AND air cleaners/CR boxes, along with basic information on how to minimize the health harms from wildifire pollution.

jimrosenthal5.bsky.social @jimrosenthal5.bsky.social · Jan 8

The horrific fires in the LA area are creating massive amounts of wildfire smoke and a reminder that communities need to be providing "safe air centers". Grants for free filters and fans to build Corsi-Rosenthal boxes are available at www.corsirosenthalfoundation.org

Welcome - Corsi-Rosenthal Foundation

Dedicated to providing cleaner safer air for all.

www.corsirosenthalfoundation.org

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Corsi-Rosenthal Foundation (US) @crfoundationus.bsky.social · Jan 9

🧵Rapid Response: Air Filters for LA

We are providing fans and filters to help LA residents breathe cleaner air during these devastating fires. Follow this thread for updates and how to get involved.

Donate to support:
paypal.com/donate?campa...

Rapid Response: Air Filters for LA

Help Corsi-Rosenthal Foundation reach their goal by donating or sharing with your friends.

paypal.com

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jimrosenthal5.bsky.social @jimrosenthal5.bsky.social · Jan 9

If you live in an area currently experiencing high levels of wildfire smoke, make sure you are using effective filters. If you are using mechanical MERV 8 filters, change them to MERV 13. This article explains why:

www.texairfilters.com/using-a-cors...

Using a Corsi-Rosenthal Box to Remove Wildfire Smoke? Make Sure to Use the Right Filters - Tex-Air Filters

By Jim Rosenthal Much of the Eastern United States is covered with wildfire smoke from the massive fires in Canada. A very effective way to avoid this respiratory hazard is to keep the windows closed ...

www.texairfilters.com

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