#crbox — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #crbox, aggregated by home.social.
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Heads up Canadian #crbox builders and PC fan air cleaner enthusiasts – Canadian Tire has a sale on 2-packs of Filtrete 1900 starting Thursday for $26.99 ($13.50 each). Normal price is $64.99, hope they are in stock by then. No rainchecks. @[email protected]
(That's like $9.64 each in USD) -
Smoke is rolling back in. Had to switch the CR box back on.
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First night having to use the CR box due to smoke. I would say it worked pretty well! We had it running in the bedroom and it really made a difference.
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Hazardous Air Quality - “Everyone should stay indoors and reduce activity levels.”
The DC region has blown past the expected Code Red Air Quality warning for Friday, July 18. It was only red for about an hour before moving to the purple “Very Unhealthy” for everyone range. Now, it’s mostly in the maroon “Hazardous” for everyone range, which is the highest this scale goes up to. This is due to wildfire smoke from Canada. Good thing rain is in the forecast for tomorrow.
If you have an N95 mask, such as the 3M Aura (which fits about 80% of adults), it is a very good idea to wear it. Under these conditions, a half piece respirator is better if you have one and need to go outdoors. Most hardware stores should have them in stock if you don’t have one on hand.
Remember that smoke rises, so stay on the lowest floor while indoors if you can. The PM levels for my upstairs rooms are much higher than my lower ones. You can seal leaky windows with painters tape and plastic sheeting to create a “safe room” with HEPA air purifiers or make a CR Box (I reposted a tutorial yesterday).
#MaskUp #N95 #StaySafe #AirQuality
#PM #HazardousAir #CodeRed #Wildfire
#HEPA #CRBox -
It would be stupid to build a #CRBox with these RGB pc fans, right? https://www.amazon.com/ARCTIC-P12-Pro-RGB-Pack/dp/B0DJD8MJ5S
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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 -
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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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I’m looking for a 3D print design for putting together original-style Corsi Rosenthal boxes (20x20x1” filters & box fan)
with no/minimum duct tape, but there are so many designs floating around it’s overwhelming.
Anyone have a favorite to recommend?(The current round of Canadian/US wildfires is about to hit my area with truly apocalyptic smoke levels. I want to srsly boost my air purifier capacity.)
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The first floor has the following #CRBox. However, it also has two Coway Airmega AP-1512HH as well. They are too noisy on high, so they run on medium. However, I'm pretty convinced that the CR box is doing the heavy lifting here. But since we spend more time on the main floor than anywhere else in the house, I wanted extra air cleansing (esp for when kids get sick).
That's an AQI of 2. The CO2 monitor shows pretty high CO2 because everything's closed up due to the heat.
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Here's our only air filter in the basement, the pc fan #CRBox. The basement is the same raw square footage as the first floor, and is divided up basically the same way (due to the way prior owners had remodeled the first floor to have an open kitchen, etc).
Yes, that is an #AQI of 4. Note that the basement is not particularly air-tight - the windows are leaky and old (we actually have water intrusion through one of them, and ants through another). There's a leaky door.
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RE: https://social.ridetrans.it/@Andres4NY/113626681357898120
Sadly I've only made 2 of them for the house (I need to buy more PC fans), but I still use these filters. Here's why.
Currently, the outside AQI in Forest Park near my house is 235 ("unhealthy for living creatures", if memory serves). #CRBox
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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 -
The Standard North Box Polaris Air Purifier Kit comes with almost everything you need, including 6 Arctic P14 fans. 💨 Just add 2 MERV-13 furnace filters (20x20x2 inch) and you’re set!
Find one at our charity store 🛒: https://buymask.ca/products/north-box-polaris
#WildfireSmoke #CRbox #WildfireSeason #NorthBox #MadeInCanada
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Looking for a stylish CR box? 💨 Consider the North Box Polaris Air Purifier Kit, which comes in Standard and Ultra versions. Both make a black aluminum air purifier that is as quiet as it is effective.
Find one at our charity store 🛒: https://buymask.ca/products/north-box-polaris
#WildfireSmoke #CRbox #WildfireSeason #NorthBox #MadeInCanada
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eed new filters for your Corsi-Rosenthal box? 💨 Donate A Mask has a 12-pack of Replacement MERV-13 Filters - AAF Flanders on sale for $299.99.
Get ready for #WildfireSmoke. Pick up a 12-pack today! Sale ends May 23. ⏰
🛍 https://buymask.ca/collections/wildfire-smoke-protection
#Ready4Smoke #MERV13 #CRBox #CanadianWildfire #WildfireSeason #AirQuality #CleanAir
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Clean the air without breaking the bank. 💨🏦 Pick up a DIY Corsi-Rosenthal Kit and build your own Corsi-Rosenthal Box for only $199.99. 🎉
Hurry! Sale ends May 23. ⏰
🛒 https://buymask.ca/collections/wildfire-smoke-protection
#WildfireSmoke #CanadianWildfires #WildfireSeason #CRBox #DIY #Ready4Smoke
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Calling all DIYers! 📣
Today only! ⏰ Use the "CRFLASH" discount code to save 30% on Corsi-Rosenthal box kits. 🎉 Each kit includes everything you need to clean the air indoors. 💨
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Want to upgrade my old 4-filter CR box to a simpler 1-filter design, but I no longer have the cardboard box that the fan came in to cut into a plenum. Can anyone share a CR box design that doesn’t require the fan’s box? Please and thank you!! #CRbox
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Is it a NAS + self-hosted jellyfin/navidrome/etc? Is it a #CRBox? ¿Por qué no los dos?
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