#corsirosenthal — Public Fediverse posts

The basic concept is 2 filters with a 3D-printed center section. The fans blow “up” and “forward”. Ideally there are handles at the top and feet at the bottom.

It’s all bolted together so that it can be moved easily and the filters can be replaced non-destructively.

#3DPrinting #CorsiRosenthal

I’ve been working on designing a #CorsiRosenthal box because I already bought the fans so I kind of have to.

Do you know why you almost never see designs using 140 mm fans? It’s because when you are #3DPrinting it, you quickly run out of bed if you want to keep things relatively simple. 120 mm fans would be a lot easier to work with.

I’m at >230 mm in one direction and printing big flat panels is probably the worst way to use a 3D printer. But we’ll see.

I didn’t want to buy anything out there because I specifically want to use 12x12 filters.

@croyle Our #CorsiRosenthal box lasts half a year for viruses, mold, pollen, dust, kitchen excesses, etc. but two weeks when outside AQI is 120 or higher. It turns a depressing shade of gray. Makes ya think.

Last month I asked for recommendations for home air purifiers as we have wanted one for some time and have found the components for the Corsi Rosenthal box to be expensive and rather ugly as a prospect.

The price of this, with taxes and shipping included was so reasonable, that it was a bit of a no-brainer.

This AirFanta 3 Pro was suggested to us as a very reasonably priced ready-made alternative. It will purify the air in up to 3100 square feet, so has an impressive performance.

After watching the videos and reading the technical reviews, we decided to order one. It's exactly the same principle as the CR box, but much quieter, using four computer fans and with all the hassle taken out of making it. There's no need for duct tape and cardboard etc etc. and changing the filters is simple with no need to tear duct tape off etc. And it's much, much quieter than would be a box fan. It's also possible to infinitely adjust the speed of the fans, making it ideal for bedroom or other rooms where at times a quieter fan is wanted.

We liked it so well, that we ordered another one, and friends of ours ordered one for themselves.

We also invested in an air quality monitor, which was rather more expensive, but that meant that we were actually able to see the results of using these in our home environment. The air quality monitor is made in Quebec and was also recommended by the same user here.

https://air-fanta.com/products/airfanta-3pro

If you have any questions about our experience with this, we'd be happy to answer them. Also I can provide a link to the air quality monitor if this is something that interests anyone. I have no connection to either company but thought that relating our experience would be helpful for someone else who might be interested in finding out about such a device.

#EllieKPosts #AirPurifier #CorsiRosenthal #AirFiltration #AirFanta

I keep reading about Corsi–Rosenthal boxes as DIY air purifiers that outperform all commercially available air purifiers.

You literally only duct-tape four HVAC filters together and slap any regular PC fan onto them.

US-Americans recommend the brand #Filtrete for MERV-rated HVAC filters, but in Europe that brand costs at least twice or thrice as much as in the USA.

Are there any equivalent affordable HVAC filters in Europe with a MERV rating of 8 or 13? Or do I simply have to swallow the additional cost because HVAC filters aren't as ubiquitous in Europe as they are in North America?

#DIY #CorsiRosenthalBox #CorsiRosenthal #HVAC #HEPA #MERV #AirQuality #AirPurifier #AirFilter

I've posted several times about how you can scale up a Corsi-Rosenthal box to the size of your house. It's not complicated. Instead of building a box, you put the furnace filters over a window screen, and then put a fan in the window farthest from the first one, blowing out, with the space around the fan sealed with cardboard or whatever you have on hand. That's it. If you want, you can have filters and/or fans in several windows.

However, if your windows are like mine, getting the filters in place and then taping them up is a rather awkward process. This morning, I realized I could take the screen out, tape the filters directly to it, and put it back in. This is not only far easier, it's also more effective, because I can do a better job taping.

Edit: I don't remember what the filters cost me, but the only other materials I used were masking tape and scrap cardboard. If you don't already have a box fan, they're not expensive.

#corsiRosenthal
#wildfire #smoke

Confession: I am a #Govee guy. Not so much the LED light strips (that's my son's domain).

Me, I am a temperature sensor guy. I have them in my fridge and freezer to mitigate food spoilage, one in a watertight container in my pool skimmer, one in a far dark corner of my basement to turn the dehumidifier on and off. One in garage to make sure it isn't too cold in the winter, one in my bathroom to turn a small space heater on and off in the winter. One in my gazebo so I know the outdoor temperature. I have two in my mum's 1960s apartment to make sure she's staying cool in the evermore frequent heat waves (set those up a few weeks ago after she called to say she wasn't feeling so good and I rushed over to take her to emergency where she was treated for heat stroke and severe dehydration. Govee will make sure that I have advance warnings now - plus we bought an AC for her apartment).

Yesterday I added one more sensor, their PM2.5 air quality sensor. It gets good reviews for accuracy (it uses the Cubic PM2008MS as its PM sensor) and is significantly cheaper than competitive products, at under $50 Canadian. This sensor is helpful because of the ever increasing number of wildfires and resultant smoke. While Environment Canada issues smoke warnings, smoke and associated air quality can be extremely local (think blobs of smoke that fall from upon high and roll through your neighbourhood). Having this sensor will warn me when AIQ is poor (it samples every 2 seconds and can trigger threshold alerts via the Govee app), and sadly, during smoke events, will also let me know when locally the AIQ is acceptable, giving confidence about when it is prudent to go indoors, and when it is okay to enjoy being outside.

Next up, I guess I'll need another one for indoors. Then the smart switches can turn on the Corsi Rosenthal air filters.

Welcome to the second quarter of the 21st century.

#ClimateChange #AIQ #WildFires #AirQuality #Smoke #Heatwave #HeatStroke #SmartDevices #HomeAutomation #Canada #Sensors #SmokeWarning #AQMonitoring #CorsiRosenthal

Met up with a fellow birder this morning, talked about birds and, of course, wildfire smoke this week.

They said they've been trying to find air purifiers at local stores, but found every one was sold out.

I said they could make their own, for less than $100 US dollars.

Shared photo of purifier I built as well as Corsi-Rosenthal box link.

https://corsirosenthalfoundation.org/

#WildfireSmoke #AirPurifier #CorsiRosenthal

@alisynthesis As a long haul strategy, the modular #OddCube #CorsiRosenthal Box should be released later this year - 3d Printable or kit-buyable, uses any brand of 10" furnace filters, runs pc fans for low energy use and easy replacement, has a cool shape (a #cuboctahedron !) - see their #Kickstarter https://beige.party/@beadsland/116889416498442008 #HEPA #DIY #3dPrinting #Wildfires #AirQuality

Some of these are big already. Smoke is finally showing up here (Eugene) and I have turned on the #CorsiRosenthal box. >>

Over 50 #wildfires ignited by #lightning strikes sweep across Central #Oregon - KTVZ

https://ktvz.com/news/2026/07/16/over-50-wildfires-ignited-by-lightning-strikes-sweep-across-central-oregon/

Finally got some filters so I can get my house air cleaned out a little.

It isn't too bad out other than the smoke. The smoke is really bad very visible.

#corsirosenthal #codered #aqi

RE: https://mastodon.nz/@oseiler/110597049520787620

Since CR boxes seem to be getting some attention again I'm still very happy with how these turned out
#CleanAir #CorsiRosenthal #CorsiRosenthalBox

How to Build a #CorsiRosenthalBox

Apr 15, 2022

"Richard L. Corsi, dean of the UC Davis College of Engineering, explains how to build a #CorsiRosenthal box. Dr. Corsi is an internationally recognized expert in the field of indoor air quality, with a specific interest in physical and chemical interactions between pollutants and indoor materials. His concept for a low-cost, accessible, and effective air cleaner, the Corsi-Rosenthal box, is now being used as an open-source do-it-yourself approach worldwide for reducing exposure to the #SARSCoV-2 virus, #WildfireSmoke and more."

For step-by-step instructions, visit the website listed below.

Video:
https://www.youtube.com/watch?v=hIuH-2naozI

Website:
https://engineering.ucdavis.edu/news/science-action-how-build-corsi-rosenthal-box

DoomsdaysCW
@DoomsdaysCW
How to Build a #CorsiRosenthalBox

Apr 15, 2022

"Richard L. Corsi, dean of the UC Davis College of Engineering, explains how to build a #CorsiRosenthal box. Dr. Corsi is an internationally recognized expert in the field of indoor air quality, with a specific interest in physical and chemical interactions between pollutants and indoor materials. His concept for a low-cost, accessible, and effective air cleaner, the Corsi-Rosenthal box, is now being used as an open-source do-it-yourself approach worldwide for reducing exposure to the #SARSCoV-2 virus, #WildfireSmoke and more."

For step-by-step instructions, visit the website listed below.

Video:
https://www.youtube.com/watch?v=hIuH-2naozI

Website:
https://engineering.ucdavis.edu/news/science-action-how-build-corsi-rosenthal-box

#CleanAir #DIY #DIYAirFilter #WildfireSmoke #WildfireHaze #AQI #AirQuality #WildfireSeason #Wildfires #MERVFilters #CorsiRosenthalBox #DIY #DIYAirFilters #OpenSource

#DIY box fan filters – #CorsiRosenthal box

"Also known as a Corsi-Rosenthal box, this DIY method of building your own air filter with #MERV13 furnace filters and a box fan are an easy and cost-effective way to help clear indoor air from airborne virus particles, wildfire smoke, pollen, dust, and more!

If you can seal a box, you can build one (or 100!) of these!"

https://cleanaircrew.org/box-fan-filters/

#OpenSource #CleanAir #CleanAirCrew #WildfireSmoke #WildfireHaze #AQI #AirQuality #ClimateDiary #WildfireSeason #Wildfires
#HEPAFilters #CorsiRosenthalBox

Ordered me up some filters to rebuild my #CorsiRosenthal box.

Seems like an annual thing now. 😔

#Kamloops
#BCWildfire

btw, I converted mine to PC fans, and they are SO QUIET. My family hates the sound of fans, and they can't even tell the box I usually have on is running... keeps the AQI usually sub 10 (working harder to keep up this week though, so more like 15).

If you are not the DIY type, this kit has everything you need for a PC fan Corsi Rosenthal (from CleanAirKits), you have to also buy the filters.

https://www.cleanairkits.com/products/brisk-box-basic-kit-original

#wildfires #airquality #corsirosenthal #smoke

#CorsiRosenthal #wildfires #SandyFire #smoke #AQI

Great design, and great post @trendless !

Thank you for all the part numbers and pictures, descriptions, etc.

After making 2 of the 1st generation Corsi-Rosenthal boxes, the next ones I build will use your design.

Slick looking, efficient, replaceable filters, and quiet.

#AirQuality #CleanAir #CorsiRosenthal #Instructions https://zeroes.ca/@trendless/114586709642615420

Spotted this cool Canadian-made air purifier: North Box Systems builds quiet, energy-efficient units using PC fans + MERV-13 filters. Think: Corsi-Rosenthal box, but sleeker. Great for wildfire smoke & allergens. 🇨🇦🌀

🔗 https://aidankepo.wixsite.com/northboxsystems
#CleanAir #AirPurifier #DIY #CorsiRosenthal #CanadaTech #environment

https://aidankepo.wixsite.com/northboxsystems

@conniptions These people will have useful info about relevant tech for safer events. https://mastodon.green/@voteoutcovid@mastodon.me.uk/114398024966462229
#CorsiRosenthal

We got interviewed by @gfsc talking about our work, #CorsiRosenthal boxes, #Django web apps, @DemocracyClub and more!

https://gfsc.community/vote-out-covid-community-spotlight/

Remember, you can get involved at https://voteoutcovid.org.uk/ before 1st May 2025!

#CovidIsNotOver #UKPol #Covid #LongCovid

With the #LocalElections coming up in England, we're asking you to lobby your council candidates to support three pledges to help reduce the spread of #Covid and other respiratory diseases:

1. Trial air filters in local schools
2. Consider air filters for pubs, bars and restaurants
3. Publish council air quality mitigations

Please get involved at https://voteoutcovid.org.uk/

#UKPolitics #CovidIsNotOver #CorsiRosenthal

(Data via @DemocracyClub)

How to Build a Corsi-Rosenthal Box

https://www.youtube.com/watch?v=hIuH-2naozI

#COVID19 #CorsiRosenthal

#CRFoundationUK on X wrote:

New hospital study: air purifiers cut airborne COVID by 98%.
Rooms with HEPA ventilation had zero virus detected.
Clean air is essential public health infrastructure — not a luxury.
Study: https://sciencedirect.com/science/article/pii/S0021850225000643
#CorsiRosenthal #CleanAir #PublicHealth

Here's the 20" #CorsiRosenthalBox I'm working on. Fans in rectangular housings basically don't exist in the UK, so I made a cardboard shim out of the box for this circular one.

This build was a proof of concept (hence the green masking tape rather than duct tape, and the plastic sheeting still on the #MERV13 filter boards). I was testing whether the shim and the boards would support the weight of the fan. Despite being a mock up it's surprisingly rigid!

Next stage involves building it properly (including sealing those gaps at the corners; the 20" fan is actually more like 21.5" across and the boards are 19.5"), then using my anemometer to measure the flow rate of the finished box, so I can work out what size room it can filter. I'm intending this one for a local community centre where a Queer Club meets, to make their meetings safer.

#CovidIsNotOver #CleanAir #CorsiRosenthal

I facilitated an online workshop for @freetechproject tonight and it's the first time we tackled technology to fight #Covid (Co2 monitors, air purifiers, #HEPA, #CorsiRosenthal boxes, #NukitTempest, etc) as well as why this is important (what Covid is, how it spreads, etc) and the small (predominantly older) group was very open to the ideas, sincerely inquisitive about the topic, interested in reducing risk, aware of inclusion issues, and sensitive to my own experiences as carer for a partner disabled by Covid. I'm also realising that people genuinely refer to "Covid" in the past tense sometimes because they wrongly associate it with government policy, while at the same time they very clearly understand that #CovidIsNotOver. My point is, keep tackling the topic, and keep giving folks the benefit of the doubt -- humans are of course good at heart and state policies, and obviously the establishment media, may very well indeed not, in fact, reflect people's actual concerns about Covid.