@jimrosenthal5.bsky.social
Interested in filtration and indoor air quality. Lifelong learner.
Many thanks for the support. Many students will benefit from your generosity!
📣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
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
October 1, 2025 at 4:03 PM
Many thanks for the support. Many students will benefit from your generosity!
Reposted
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?...
youtu.be/hIuH-2naozI?...
How to Build a Corsi-Rosenthal Box
YouTube video by UC Davis College of Engineering
youtu.be
September 25, 2025 at 11:56 AM
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?...
youtu.be/hIuH-2naozI?...
Really excellent work! This test should be required for all air cleaners that produce chemical byproducts! (CR Boxes do not,)
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/...
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
September 2, 2025 at 10:52 PM
Really excellent work! This test should be required for all air cleaners that produce chemical byproducts! (CR Boxes do not,)
Reposted
Glad it helped you and the cats!
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
August 31, 2025 at 7:02 AM
Glad it helped you and the cats!
Reposted
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...
www.epa.gov/system/files...
August 27, 2025 at 4:10 AM
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...
www.epa.gov/system/files...
Reposted
This is great. An EPA activity book for elementary school kids on air cleaning:
www.epa.gov/system/files...
www.epa.gov/system/files...
www.epa.gov
August 26, 2025 at 3:06 PM
This is great. An EPA activity book for elementary school kids on air cleaning:
www.epa.gov/system/files...
www.epa.gov/system/files...
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...
doi.org/10.1016/j.bu...
August 24, 2025 at 7:12 PM
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...
doi.org/10.1016/j.bu...
Reposted
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
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
July 16, 2025 at 7:21 PM
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
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
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.)
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.)
June 15, 2025 at 9:15 PM
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.)
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.)
Wildfire smoke is covering large areas of the US. Time to make a Corsi-Rosenthal Box. They work!
www.spokesman.com/stories/2025...
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
June 10, 2025 at 8:15 PM
Wildfire smoke is covering large areas of the US. Time to make a Corsi-Rosenthal Box. They work!
www.spokesman.com/stories/2025...
www.spokesman.com/stories/2025...
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...
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
May 29, 2025 at 4:20 PM
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...
attheu.utah.edu/research/doe...
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
May 18, 2025 at 8:40 PM
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
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!
May 16, 2025 at 6:57 PM
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!
I have tested MERV 13 washable filters. All have been very resistant to air flow. I would not recommend using them in CR boxes.
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?
@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
March 25, 2025 at 4:55 PM
I have tested MERV 13 washable filters. All have been very resistant to air flow. I would not recommend using them in CR boxes.
Excellent article on the effectiveness of Corsi-Rosenthal Boxes on wildfire smoke and other PM2.5 airborne contaminants:
www.washingtonpost.com/climate-solu...
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
March 25, 2025 at 4:48 PM
Excellent article on the effectiveness of Corsi-Rosenthal Boxes on wildfire smoke and other PM2.5 airborne contaminants:
www.washingtonpost.com/climate-solu...
www.washingtonpost.com/climate-solu...
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!
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
Learn more at:
CleanAirK12.com
CorsiRosenthalFoundation.org
#CRBox #CleanAirK12
Full Video:
youtu.be/dUYLPUfkv0g
February 24, 2025 at 11:55 PM
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!
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.
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)
(🧵 1/15)
January 14, 2025 at 4:55 PM
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.
Reposted
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)
January 12, 2025 at 11:03 PM
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)
Reposted
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.
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.
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
January 10, 2025 at 2:55 PM
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.
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.
Reposted
🧵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...
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
January 9, 2025 at 11:31 PM
🧵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...
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...
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...
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
January 9, 2025 at 4:50 PM
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...
www.texairfilters.com/using-a-cors...
The purpose of this post is two-fold. 1. There is a crisis with wildfire smoke in LA. We will do everything we can to be supportive. But the logistics are a nightmare. 2. If you live in an area where wildfire smoke is a concern, now is the time to obtain the supplies to create a "safe air center."
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
January 9, 2025 at 2:47 PM
The purpose of this post is two-fold. 1. There is a crisis with wildfire smoke in LA. We will do everything we can to be supportive. But the logistics are a nightmare. 2. If you live in an area where wildfire smoke is a concern, now is the time to obtain the supplies to create a "safe air center."
Yes. It is super easy to build. But, best of all, it works!
The Corsi-Rosenthal box is an amazing thing! I made one last year for my home when our air quality was so bad, and it was easy peasy. After turning it on, it took far less than a minute for the air to smell fresh and clean.
January 8, 2025 at 8:27 PM
Yes. It is super easy to build. But, best of all, it works!
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
January 8, 2025 at 7:54 PM
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
Reposted
The 2024 Corsi-Rosenthal Box Awards are finally here. Congratulations to all of the winners!
Note that as indicated in this thread - some of the recipients posted on another platform (with link provided here).
Let's get the party started! Drum roll, please.
Note that as indicated in this thread - some of the recipients posted on another platform (with link provided here).
Let's get the party started! Drum roll, please.
January 5, 2025 at 2:05 AM
The 2024 Corsi-Rosenthal Box Awards are finally here. Congratulations to all of the winners!
Note that as indicated in this thread - some of the recipients posted on another platform (with link provided here).
Let's get the party started! Drum roll, please.
Note that as indicated in this thread - some of the recipients posted on another platform (with link provided here).
Let's get the party started! Drum roll, please.