#aircleaners — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #aircleaners, aggregated by home.social.
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RE: https://social.ridetrans.it/@Andres4NY/116931466428900883
Tagging this thread for #SolarPunkSunday... Discussions about building one's own #CorsiRosenthalBox from folks who have built them. These ones use computer fans, which are a lot quieter than the box fans recommended in the original instructions by Corsi.
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'Dangerous' air quality in Detroit, Minneapolis as thick wildfire smoke shrouds the sky for millions
Smoke from wildfires burning in Ontario have caused air quality to reach "dangerous" levels across Canada, and the northeastern and midwestern United States. And it could get worse before conditions improve.
By Brian Lada, AccuWeather meteorologist
Published Jul 15, 2026 11:50 AM EDT | Updated Jul 16, 2026
" Massive plumes of smoke are descending across parts of Canada and the United States, creating dangerous air quality and scenes reminiscent of the historic wildfire smoke outbreak from three summers ago.
" 'In 2023, a major fire outbreak in Quebec caused days of unhealthy air quality in the northeastern U.S.,' AccuWeather Vice President of Forecast Operations Dan DePodwin said. 'This event could cause similar levels of poor air quality in spots.'
"Air quality alerts have been issued for millions of people, including across all of #Connecticut, #Delaware, #Massachusetts, #Michigan, #NewHampshire, #NewJersey, #NewYork, #Ohio, #Pennsylvania, #RhodeIsland and #Wisconsin.
"Over 800 wildfires are currently burning across Canada, including dozens that are out of control across western #Ontario, the source of most of the smoke. 'Many of these fires may have been started by lightning,' AccuWeather Senior Meteorologist Brett Anderson said.
"On Wednesday, #Toronto had some of the worst air quality in North America, reaching 'very unhealthy' levels with an AQI of 220. #BostonMA was not far behind with an unhealthy AQI of 147.
" 'When the AQI climbs into the 150+ range for a full day outside, that’s in the ballpark of [smoking] 7 to 9 cigarettes,' Dr. Jonathan M. Tan, division chief of General Anesthesiology at Children’s Hospital of Philadelphia, told AccuWeather.
"Conditions deteriorated by Thursday morning, with widespread "dangerous" air quality across nearly all the Great Lakes region and into parts of the Northeast. Minneapolis and Duluth, Minnesota, as well as Detroit, were among the worst cities at daybreak Thursday, with AQIs over 340.
" 'Any exposure to the air, even for a few minutes, can lead to serious health effects on everybody,' Plume Labs said.
Avoid outdoor activities.' "#CanadianWildfires #CRBox #AirQuality
#WildfireSmoke #AQI #HEPAFilters #CorsiRosenthalBox #AirCleaners #Masks #ParticulateMatter #RespiratorMasks #StayIndoors #HazardousAir #AirQualityAlert -
Canadian #wildfire smoke turns air hazardous in the US #Midwest. Officials say stay inside
By TAMMY WEBBER and PHILIP MARCELO, July 16, 2026
NEW YORK (AP) — "Heavy, pungent smoke from #CanadianWildfires darkened skies in the U.S. on Thursday from the #GreatLakes to parts of the #EastCoast, reducing visibility for commuters and prompting warnings that air quality could make being outside dangerous.
"#Detroit’s air quality was among the worst in the world for major cities, as a lingering high pressure system trapped smoke from dozens of fires in Canada and northern Minnesota, said Steven Freitag, a National Weather Service meteorologist in Pontiac, Michigan.
" 'Sure enough, it arrived in force here and it’s really pretty extreme levels,' said Freitag, who noted that visibility in some areas was reduced to a half mile.
"Omar Mitchell wore a mask as he walked to his restaurant in Detroit. He said he urged his employees to do the same.
" 'It’s scary,' Mitchell, 50, said as he looked at the sky. 'You don’t know necessarily what the side effects may be. That’s days or months later.'
"Cities across the Great Lakes states registered air quality ranging from unhealthy to hazardous — which means it’s unhealthy for anyone, regardless of health conditions. Microscopic particles can lodge deep in the lungs and enter the bloodstream, leading to heart and lung problems and contributing to other long-term health issues.
"All of #Michigan and much of #Minnesota were under a hazardous #AirQualityAlert. In the Chicago area, air quality ranged from very unhealthy to hazardous.
"National Weather Service meteorologist Jake Petr said even if winds from the northwest clear skies as expected later this week, the smoky air could keep returning until the fires are out. That could take weeks or longer.
" 'Anytime we have something that could bring air from that region until the fires are over, it could conceivably dip back into the area,' Petr said.
"In #SaintPaulMN, the air was 'glowing yellow,' said Brent Williams, head of the soil, water and climate department at the University of Minnesota, who said the area 'could be looking at weeks to months of continued smoke and flare-ups off and on as the winds blow in different directions.'
"A study published this year found that long-term exposure to tiny particles from wildfire smoke contributed to an average of 24,100 deaths a year in the lower 48 states. Long-term exposure can make existing health problems worse and lead to a range of chronic and deadly health issues, including respiratory illness, cardiovascular and neurological diseases, and premature death."
https://apnews.com/article/canada-wildfires-smoke-us-ae4b2bd09a97919a081e26ede6a6d355
#CRBox #AirQuality #WildfireSmoke #AQI #HEPAFilters #CorsiRosenthalBox #AirCleaners #Masks #ParticulateMatter #RespiratorMasks #StayIndoors #ThanksBigOil
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How and When to Change the Filters in Your #CorsiRosenthalBox
by WCAHS September 18, 2023
"Corsi-Rosenthal Boxes provide excellent filtration of indoor air, especially for particles containing the virus that causes COVID-19 and wildfire smoke. After assembling and using your Corsi-Rosenthal Box, you may be wondering when and how to change the filters.
When to change the filters"The filters used in Corsi-Rosenthal Boxes generally have a lifespan between 1,000 to 4,000 hours of actual use time on the mid-flow setting. The range varies based on the size of the filter (one inch or two inches), frequency of use, and differences in the indoor environment in which it is being used. For example, it is best to change the filters nearer to 1,000 hours for a dusty indoor setting with carpeting and/or indoor pets. Changing the filters at approximately 4,000 hours is recommended for a relatively clean indoor environment without carpet.
"This filter change recommendation means that you could use a Corsi-Rosenthal Box on the mid-flow setting in an uncarpeted office, for example, for eight hours a day, five days per week and the filters would last for about 25 months. In contrast, a Corsi-Rosenthal Box used for six hours a day, five days a week in a breakroom adjacent to a workshop with people coming and going would need to have the filters changed after about eight months.
"Many people underestimate the life of the filter because they compare it to a filter in an HVAC system or assume that it needs to be changed because it looks dirty. The timeframe for changing the filters in a Corsi-Rosenthal Box is different from changing filters for an HVAC system because the filter width and the air speeds through the filters are different between an HVAC system and a Corsi-Rosenthal Box. In a Corsi-Rosenthal Box, discoloration means that the filter is working and does not necessarily mean that it is time to change the filter.
How to change the filters
- Switch the system off for at least six hours before removing the filters to limit exposure to newly deposited viruses.
- Take the box outside or to a large open area inside. Removing the filters may release a small amount of particles.
- It is recommended to wear a KN95 mask or better while changing the filters.
- Working one by one, cut each filter away from the fan and gently place it in a trash bag. Be careful to not shake or drop the filter as sudden movement can disperse dust and particles into the air.
- Follow this step again for all filters in your Corsi-Rosenthal Box. Change all filters the same day. Never use a combination of new and used filters in your Corsi-Rosenthal Box.
- Tie the bag tight and put it in the garbage. Wash your hands thoroughly with soap and water.
- Using new filters, you can now reassemble your Corsi-Rosenthal Box.Note: If the cardboard base is damaged or worn, you will need to replace the cardboard when replacing the filters in order to properly rebuild your Corsi-Rosenthal Box for maximum efficiency.
Summary
- The filters in Corsi-Rosenthal Boxes have a lifespan of 1,000 to 4,000 hours.
- Many people underestimate the lifespan of a filter.
- Although risk of exposure from discarding the filters is very low, precautions, such as wearing a KN95 mask or better, are recommended when changing filters.
- All filters should be changed at the same time."Source:
aghealth.ucdavis.edu/news/how-and-when-change-filters-your-corsi-rosenthal-box#CRBox #AirQuality #DIYAirFilters
#WildfireSmoke #AQI #HEPAFilters #CorsiRosenthalBox #AirCleaners -
Scientists Tested a DIY Air Cleaner – And It Beat Expensive Filters
By American Chemical Society, March 24, 2025
Excerpt: "As Corsi highlights during his presentation, he and his colleagues recently tested the durability and performance of #CRBoxes by installing units in four locations across the UC Davis campus. They ran them for 2,500 hours — the equivalent of two K-12 school years.
"The CR Box filters performed as well or better than comparable #HEPAFilters. The #DIY system was also more effective at clearing particles 1-3 micrometers in diameter than particles 0.35-1 micrometers. For a sense of scale, typical smoke particles are smaller than 1 micrometer, whereas dust and pollen are 0.5-3 micrometers.
"Although HEPA filters are more efficient at removing particles in a single pass than the HVAC filters used in the DIY system, Corsi explains, much more air passes through the CR Boxes, leading to more particles being removed from the air. Although the CR Boxes’ effectiveness diminished over time, they still performed better than new and more expensive HEPA air filters for the larger particle size and performed competitively with HEPA for smaller particles over the extended study period."
Read more:
https://scitechdaily.com/scientists-tested-a-diy-air-cleaner-and-it-beat-expensive-filters/#DIYAirCleaner #CorsiRosenthalBox #CorsiRosenthalBox #AirCleaners #AirFilters #DIY #WildfireSmoke
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Written back when the #US #EPA cared about #CleanAir!
Do-It-Yourself #AirCleaners: Making Cleaner Air More Accessible
Published September 6, 2023
"Everyone should have the right to breathe clean air. However, during wildfires, the cost and availability of clean air technologies and reliable power sources can create challenges for people trying to protect their health from wildfire smoke. Recognizing these barriers, EPA and other health, environmental, and nonprofit organizations have provided instructions and materials for creating do-it-yourself (#DIY) air cleaners. DIY air cleaners are a more affordable and accessible alternative to commercial versions and can be constructed using a box fan and a high-efficiency home air filter. Securing the filter to the fan creates an effective, simple air cleaning system.
"This DIY solution filters out smoke particles and improves indoor air quality, but its use has raised key questions about the devices’ safety and effectiveness. EPA scientists and their colleagues are conducting research to answer these questions.
" 'This research was highly anticipated, particularly by EPA’s western regions, who have suffered from terrible wildfire smoke for years without the ability to recommend more affordable air filtering options to the public,' noted Meredith Bauer, Assistant Director of EPA Region 9’s Air and Radiation Division. 'It is important that we develop tools that allow everyone to protect themselves and their families when wildfire smoke is in the air.' "
Learn more [includes diagrams and instructions]:
https://www.epa.gov/sciencematters/do-it-yourself-air-cleaners-making-cleaner-air-more-accessibleArchived version:
https://archive.ph/6USXC#AirQuality #DIYAirFilters #WildfireSmoke #Northeast #WildfireHaze #AQI #AirQuality #ClimateDiary #WildfireSeason #Wildfires #HEPAFilters #CorsiRosenthalBox
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“Clean Air Delivery Rate Is All That Matters!” (also noise levels)
https://itsairborne.com/clean-air-delivery-rate-is-all-that-matters-5a5a064c211e
By @joeyfox
#cleanair #hepafilter #hepa #aircleaners -
Lazyweb request again: Can anyone provide an up to date bill of materials with sources for UK builds of Corsi-Rosenthal Box air cleaners.
The Vent Axia box fan is discontinued and out of stock. The 20x20x1, MPR 1900 filters are hard to find and expensive. Alternatives?
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"Portable HEPA air cleaners can reduce exposure to simulated SARS-CoV-2 aerosols in indoor environments, especially when combined with universal masking."
https://www.cdc.gov/mmwr/volumes/70/wr/mm7027e1.htm
#PortableHEPAAirCleaners #PortableAirCleaners #AirCleaners #HEPA #COVID #COVID19 -
'Efficacy of Do-It-Yourself air filtration units in reducing exposure to simulated respiratory aerosols'
#CorsiRosenthalBoxes #coronavirus #aerosol #AirCleaners
https://www.sciencedirect.com/science/article/pii/S0360132322011507
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Introduction:
I’m an environmental engineer and professor at CU Boulder. I work with aerosols (tiny particles in air that are bad for you to breathe), especially in indoor air.
A few interests:
#aerosols #indoorairquality #airquality #airpollution #COVIDisAirborne #lowcostsensors #aircleaners #wildfires #Professoring -
Former Trump advisor joins company that makes hazardous air cleaners - Enlarge / U.S. President Donald Trump, right, listens to Deborah Birx, coronavirus response coordin... - https://arstechnica.com/?p=1752262 #publichealth #aircleaners #ventilation #sars-cov-2 #science #birx