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

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