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a shooting star with the words " the more you know " behind it Alt: a shooting star with the words " the more you know " behind it

#CRbox air filtration
Wear #N95 respirator in public indoor spaces
#iotacarrageenan nasal spray 3x a day to help prevent COVID infection
#avoidlargecrowds
All of these together are successful layers of protection that #PREVENTCOVID infection
No COVID=NO COVID DISABILITY/DEATH
#TheMoreYouKnow

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Monitor streamers outside of mech vent diffusers to show if system is on/off.
Students can work on measurement/science activities involving PC fan #CRbox design (construction if funds permit).
Education is key🙌

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Hell yeah N95 masking helps PREVENT COVID infection🙌
Masking is one of my essential layers of protection along with iota-carrageenan nasal spray, astrodrimer spray, #CRbox filtration, & ⏫️ ventilation of all indoor spaces.
Working perfectly for almost 3 years now and counting👍

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Desktop P12 PC-fan #CRbox 3D printed framing for Uppatvïnd Ikea filter would be an amazing project🙌

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Great tool of ingenuity used to create the most affordably versatile indoor air filtration device around to help clean your indoor air as the COVID pandemic continues.
#CRbox
#PreventAirbornePathogenSpread
#DefinitelyHandy

Lots of CR box variety:
photos.app.goo.gl/QSc67keCyXAa...

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"Black Friday Sale - buymask.ca
30% off Corsi-Rosenthal Box DIY Air Purifier Kit"
Images of a CR Box DIY Kit (Fan, MERV-13 filters, wheels and white tape).

"Black Friday Sale - buymask.ca 30% off Corsi-Rosenthal Box DIY Air Purifier Kit" Images of a CR Box DIY Kit (Fan, MERV-13 filters, wheels and white tape).

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. 💨

🛒 buymask.ca/cr-box

#DIY #CRBox #FlashSale #BlackFridaySale #CleanAir

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Desktop CRbox specs

Desktop CRbox specs

PC fan CRbox with Uppatvïnd Ikea filter.

PC fan CRbox with Uppatvïnd Ikea filter.

Last year we designed this excellent desktop #CRbox to help prevent close-contact airborne pathogen spread in our classroom.
#HealthMatters
#N95
#CRbox
#PreventCOVID

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Adding to this CO2 monitoring tech, the perfect venue would include whisper-quiet PC fan #CRboxes spread throughout the facility because the MERV-8s will do virtually nothing to remove PM2.5s from the indoor air.
Here is a great DIY #CRbox
youtu.be/Ird0-orsSGM?...

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photo of a small cardboard box. It contains a cable a white computer fan and a note written on Hello Kitty notepaper.

photo of a small cardboard box. It contains a cable a white computer fan and a note written on Hello Kitty notepaper.

The Covid Safe Scout Proficiency Badge for making your own Corsi-Rosenthal Box or other DIY air purifier. It is round and in the middle is a box the lid of which is a box fan and the four walls are filters. One side says MERV 13.

The Covid Safe Scout Proficiency Badge for making your own Corsi-Rosenthal Box or other DIY air purifier. It is round and in the middle is a box the lid of which is a box fan and the four walls are filters. One side says MERV 13.

The beauty of Covid Mitigation Club is that it has so many kind and good looking members.
Because I am the weirdo who likes to think about fan-filter boxes and have cables and fans and other bits laying about, I have been fortunate enough to be able to help someone […]

[Original post on mas.to]

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We most definitely are amidst a COVID surge in ON now. Evidence in schools & wastewater is clear.
N95 or better, #CRbox, open windows/doors, avoid crowds, use iota-carrageenan nasal sprays.
Layers of protection must be maintained to avoid Covid infection.

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@robwissink.bsky.social made one of the best PC fan #CRbox support videos out there. He reviews all of the materials/tools you would need to build your own PC fan #CRbox

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Video

I built this #CRbox using a @donatemask.bsky.social box fan for another teacher/classroom.
Another teacher saw me carrying it down the hall and asked me what it was, so I told her.
She said, "That's cool!"
Its so much more than that! It supports health & longevity (potential futures of many kids).

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CRbox with Fornüftig filter foamboard frame.

CRbox with Fornüftig filter foamboard frame.

When it came time to change the filters of our full-sized #CRbox I decided to create a foamboard frame for Ikea Fornüftig filters instead. Filter replacement cost is MUCH cheaper in this design & it still works amazingly🙌🙌

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Diagram showing the construction of a box-shaped do-it-yourself air purifier with 20" MERV 13 air filters for the sides (with air flow oriented into the box), a cardboard base, and 20" box fan as the top (with air flowing upwards with a cardboard shroud, all held together with duct tape..

Diagram showing the construction of a box-shaped do-it-yourself air purifier with 20" MERV 13 air filters for the sides (with air flow oriented into the box), a cardboard base, and 20" box fan as the top (with air flowing upwards with a cardboard shroud, all held together with duct tape..

As we move into fall and correspondingly cooler temperatures, this is your irregular reminder that building a Corsi-Rosenthal Box or Comparetto Cube to keep the air in your immediate indoor environment clean is both very easy AND very inexpensive. #COVID #CRbox

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A box fan and air filters taped together to form a large box sits on the floor. The fan is pointed up and one filter side is visible. The box is framed with blue duct tape and cardboard with a “police public call box” sign made to look like a tardis.

A box fan and air filters taped together to form a large box sits on the floor. The fan is pointed up and one filter side is visible. The box is framed with blue duct tape and cardboard with a “police public call box” sign made to look like a tardis.

Wildfire smoke is BAD today. Thankful to my past self for making some air purifiers. This one is Dr. Who themed! #CleanAir #CRBox

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Donated laptop with Xubuntu & 3PC fan Airplate CR box frame being built.

Donated laptop with Xubuntu & 3PC fan Airplate CR box frame being built.

Building one more #CRbox today, while I repurpose a donated 💻 with @xubuntu.bsky.social
The 💻 is going to a local grade 3 class at Malala Yousafzai PS to support student exploration & learning🙌

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Foamboard framing for 3-fan plate

Foamboard framing for 3-fan plate

Foamboard framing for Fornüftig Ikea filter walls

Foamboard framing for Fornüftig Ikea filter walls

3 fan plate will be re-built into a Fornüftig #CRbox

3 fan plate will be re-built into a Fornüftig #CRbox

Been a busy morning with final classroom tidying and #CRbox building.
Trying to help reduce close-contact spread of airborne pathogens, like COVID-19, between my students.

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They are and always will be my friends. They, like most people in society, chose to listen to piss-poor government guidance re: masking and chose to believe the pandemic was over.
I tried to help them with guidance re: proper masking, avoiding busy indoor spaces, and #CRbox building...

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We are careful to ensure we are using very low voltage #CRbox systems & uL certified plugs.
This more than satisfies and electrical safety requirements in Ontario.
Perhaps government should start governing by ensuring all public indoor spaces have cleaner air to prevent airborne pathogen spread.

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School boards & gov'ts attempt to argue that #CRboxes in classrooms aren't safe.
Perhaps they should offer funding and support of in-class #CRbox construction activities to improve learning & make it even safer.
For the record, we've been using #CRboxes effectively for 3 years now without any probs.

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Knowing boards were attempting to block teachers & students from using #CRboxes in schools, I decided to embed #CRbox construction into our math, language, and science curriculum in grade 6.
If #CRbox building is part of the learning, then it can't be removed from classrooms.

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Its not cheap but completely necessary. Student health is tied directly to teacher health because we work closely 5 days a week in small classrooms.
Board red tape makes it VERY difficult to buy #CRbox materials, so I usually invest in them myself.
We all need cleaner air.

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Around this time each year, I'm usually looking for sales on DPA equipment for my students. The kids love playing games, while exercising outside each day.
I also start buying #CRbox equipment too for cleaning the air in our classroom. I like to have it all running before students begin in Sept.

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Post image Post image

Thank you. All credit to the 13-year-old student who took the filter photos. This secondary school isn’t in a city, just a typical Hampshire town. It’s no wonder sickness absence is high.
#CRBox #CleanAir

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Boxes of CA-N95 respirator masks sitting on top of a brown cabinet in a lecture room.

Boxes of CA-N95 respirator masks sitting on top of a brown cabinet in a lecture room.

Two black PC fan air cleaners sitting in the corner of the room on blue carpet in front of an orange wall (they are in storage for use at the symposium event)

Two black PC fan air cleaners sitting in the corner of the room on blue carpet in front of an orange wall (they are in storage for use at the symposium event)

And we’ll have 2 PC-fan air cleaners plus a traditional #CRbox running, of course.

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CRbox  back shot featuring 4Lite filters and worbla over foam core lids.

CRbox back shot featuring 4Lite filters and worbla over foam core lids.

CRbox front shot featuring Noctua slim 120mm fans

CRbox front shot featuring Noctua slim 120mm fans

New #CRbox using 4Lite filters and Noctua fans.
Oh it's front heavy... Also ran into a few hiccups during production as issues I didn't forsee popped up and I had to re-work to make it fit.
Because NZ has nothing I'm still waiting for the PWM to DC adapter cables to arrive...

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Preview
CR Box Designs · May 15, 2022 – Apr 20, 2025 📸 Shared album · Tap to view!

To see more of our #CRbox design/building journey please check it out here:
photos.app.goo.gl/QSc67keCyXAa...
We have some design plans/ideas in this photo folder too.
Help yourself as you try to help clean the air for all🙌

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First student-designed & constructed desktop, PC-fan #CRbox. From design to prototype.

First student-designed & constructed desktop, PC-fan #CRbox. From design to prototype.

By March 1, 2024, our first student desktop #CRbox was operational in our classroom. Their job was to help reduce close-contact spread of airborne pathogens.
They definitely helped, and continue to help to this day!

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#CRbox testing chamber in classroom. Could also be used for its original purpose as a greenhouse😉

#CRbox testing chamber in classroom. Could also be used for its original purpose as a greenhouse😉

Our classroom #CRbox testing chamber (see image).
By this point in 2024, I was tracking attendance too, and noticed a 25% (min) improvement in my class vs all other classrooms. #CRboxes and masking were helping my students avoid airborne pathogen spread.

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Grade 6 student designing a #CRbox net.

Grade 6 student designing a #CRbox net.

By Feb 2024, we had integrated #CRbox construction and experimentation in our math and science units in grade 6.

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