#CRBox
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trentonhoshiko.bsky.social
Evangelizing CR Boxes to these duct cleaner guys

#cleanair #crbox
October 24, 2026 at 12:39 AM
fritzoids.mas.to.ap.brid.gy
Gerade zufällig entdeckt, dass Arctic im Moment bis zu 60% Rabatt gewährt.

Vielleicht ja interessant für diejenigen die sich einen DIY Luftfilter bauen wollen. https://youtu.be/Ird0-orsSGM

https://www.arctic.de

#Lüfter #saubereLuft #crbox #fanfilterbox #CovidIsNotOver
auf der Webseite der Firma Arctic ist ein kleiner Banner auf dem steht: It's Payback Time! Bis zu 60 % automatischer Rabatt im Warenkorb. Kostenloser Versand ab 39 € in Deutschland / 59 € außerhalb Deutschlands.
October 15, 2026 at 5:25 AM
cleanairkits.bsky.social
You might think it’s *inevitable* that kids will get sick, especially at school. We understand why you think that because it’s the #1 place kids pick up illness. But did you know it’s NOT inevitable?

#cleanair #crbox #cleanairkits #healthyschools #diypurifier
September 22, 2026 at 9:02 PM
cleanairkits.bsky.social
If you're able to donate one or two purifiers to a classroom near you or have a chat with a teacher you know to explain the benefits, it might keep you or someone in your community from avoiding the next illness.

#cleanair #crbox #cleanairkits #healthyschools #diypurifier #transmissabledisease
September 15, 2026 at 9:10 PM
cleanairkits.bsky.social
By all means–keep up the good hand hygiene. Huge kudos to the teachers helping kindergartners get in the habit of washing their hands after using the bathroom and before eating…and doing it for the full 20 seconds!

#cleanair #crbox #cleanairkits #healthyschools #diypurifier
September 11, 2026 at 11:16 PM
cleanairkits.bsky.social
For typical classrooms, try to stay under 45 decibels so that the purifier doesn’t need to be turned off or down to a less effective setting. All of our purifiers are 45 dB or lower except the Brisk Box Ultra Black which is 48 dB.

#cleanair #crbox #cleanairkits #healthyschools #diypurifier
September 9, 2026 at 6:57 PM
cleanairkits.bsky.social
You might think it’s *inevitable* that kids will get sick, especially at school. We understand why you think that because it’s the #1 place kids pick up illness. But did you know it’s NOT inevitable?

#cleanair #crbox #cleanairkits #healthyschools #diypurifier
September 10, 2026 at 6:19 PM
cleanairkits.bsky.social
You can also buy and donate or build and donate air purifiers that are quiet enough to work in classrooms. For gyms and cafeterias, you can get away with loud purifiers, so consider building CR boxes.

#cleanair #crbox #cleanairkits #healthyschools #diypurifier
September 8, 2026 at 6:04 PM
donatemask.bsky.social
Clean the air in your dorm room with a Corsi-Rosenthal Box DIY Air Purifier Kit. The kit is on sale now for $199.99! 🎉

We also have North Box Air Purifier Kits, which are quieter and smaller, for sale. 💨

donatemask.ca/shop

#CleantheAir #Sale #CRBox
“Back to School Sale - buymask.ca” on a white sticky note against a background of illustrations of school supplies. There is an image of the Corsi-Rosenthal Box DIY Air Purifier Kit (Box fan, MERV-13 filters, wheels and white tape.
September 4, 2026 at 11:45 AM
saskboy.bsky.social
www.youtube.com/watch?v=gaQT... #CRBox for the win instead. DIY at home with a box or PC fans, and MERV-13 air filters taped together.
Most HEPA Air Purifiers Are A SCAM (There's A Better Option)
YouTube video by Healthy Home Guide
www.youtube.com
August 28, 2026 at 9:05 PM
dd86k.space
Every day is a reminder I need to make a crbox (Corsi-Rosenthal Box) !!! aaa
August 14, 2026 at 3:02 PM
kellyharrison.bsky.social
3 #CRbox filters in our house. A large one in the open area and two 10" ones. We have another hepa filter but honestly the CR with merv13 works great.
November 28, 2023 at 8:55 AM
harpnote.bsky.social
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...
CRbox back shot featuring 4Lite filters and worbla over foam core lids. CRbox front shot featuring Noctua slim 120mm fans
July 19, 2025 at 5:14 AM
harpnote.bsky.social
New #CRbox using 4Lite filters.
I miscalculated the extra width by 1-2mm for the worbla... As a result it's really tight to squeeze the filters in...
Waiting for the PWM to DC cable to arrive from Ali, and then to source a 12V DC power locally...
I forgot how long working with worbla takes...
New CR box with Noctua slim 120mm fans, 4Lite filters and worbla covered foam core end caps. Work in progress.
June 29, 2025 at 9:30 AM
cleanairclassrm.bsky.social
Thankyou to everyone who is advocating for
#SafeAir #CleanAir
#HealthyAirCoalition
Indoors and Outdoors

@ellarobertafdn.bsky.social @airborneallergy.bsky.social @cvcev.bsky.social
@peteuk7.bsky.social
Stefan @plasticfull
( Congrats @smartairuk.bsky.social )

youtu.be/9OI9y5_C5SI?...
DIY CRbox BreatheForEllaEvent 1080p
YouTube video by Clean Air Classrooms
youtu.be
October 17, 2025 at 8:52 PM
cleanairclassrm.bsky.social
#AirPollution
#IndoorAirPollution
#CovidIsAirborne

Protect Vulnerable Children
Who deserve to breathe
#CleanAir
For 🫁🫀😄
To thrive and learn
And safe environments

youtube.com/watch?v=9OI9...
DIY CRbox BreatheForEllaEvent 1080p
YouTube video by Clean Air Classrooms
youtube.com
March 14, 2025 at 11:12 AM
cleanairclassrm.bsky.social
Importantly
This project
For DIY #AirFilterUnits #CRBox was started by Marina Creed
@MarinaC_dyb.bsky.social
To scale up CR Boxes
For Every Classroom in Connecticut
@uconnhealth.bsky.social

HT @kprather.bsky.social
Screenshot top of thread post by Marina Creed a neuro - immunology nurse practitioner since 2017 @uconnhealth treating people with MS Explaining her project " After 3 long years of tireless work, our cross campus, multidisciplinary academic team reaching out goal: State of CT support to scale up CR Boxes for every classroom in Connecticut "
November 30, 2024 at 11:06 AM
drseanmullen.bsky.social
Five. That’s just the 1st floor.

It doesn’t count the Levoit 300 in the guest bedroom on floor one or the CRBox I made for the garage.
November 26, 2024 at 4:37 AM
drseanmullen.bsky.social
Please call your senators on Monday! Ask that they vote for this!

Cleaner air means less sickness, less absences, greater cognitive performance & better grades.

#CleanTheAir
#KidsAreTheFuture
#HEPA #HVAC #CRBox #CorsiRosenthalBox #ASHRAE #AirFiltration #Ventilation #IndoorAirQuality
#IAQ
November 23, 2024 at 4:38 AM
luchioluli.bsky.social
Filter change!
#CRbox
November 12, 2024 at 10:18 PM
andres4ny.social.ridetrans.it.ap.brid.gy
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
Amazon.com: ARCTIC P12 Pro A-RGB - 3 Pack - Powerful Premium Fan, 120 mm PWM Fan with Y-Cable Splitter, 600-3000 RPM, 0 RPM <5% PWM, 5V Digital RGB, Fluid Dynamic Bearing, 4-Pin - Black : Electronics
Buy ARCTIC P12 Pro A-RGB - 3 Pack - Powerful Premium Fan, 120 mm PWM Fan with Y-Cable Splitter, 600-3000 RPM, 0 RPM <5% PWM, 5V Digital RGB, Fluid Dynamic Bearing, 4-Pin - Black: Case Fans - Amazon.com ✓ FREE DELIVERY possible on eligible purchases
www.amazon.com
July 17, 2026 at 3:27 AM
andres4ny.social.ridetrans.it.ap.brid.gy
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 […]

[Original post on social.ridetrans.it]
Another of those Corsi-Rosenthal boxes, made with two 20x20x1 filters and two 10x20x1 filters and 8 PC fans. It's in a corner as opposed to out in the open, but that doesn't appear to be a problem. Two Temtop air monitoring devices. The one on the left shows a PM2.5 of 0.7, and an AQI of 2. The one on the right shows CO2 levels at 1436 ppm. Someone stick two eyeball stickers on the left air monitor. Because children.
July 16, 2026 at 2:47 AM
andres4ny.social.ridetrans.it.ap.brid.gy
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 […]

[Original post on social.ridetrans.it]
A CR box made of two 20x20x1 inch air filters, and two 10x20x1. On top of the CR box, 8 black PC fans are zip-tied together. Zoomed in on a Temtop air quality monitor. The monitor shows PM2.5 of 0.8 ug/m3, and an AQI of 4.
July 16, 2026 at 2:39 AM
andres4ny.social.ridetrans.it.ap.brid.gy
Is it a NAS + self-hosted jellyfin/navidrome/etc? Is it a #CRBox? ¿Por qué no los dos?"
An ebay listing for a 9U open frame 4 post server rack with caster wheels. It's around $200, and the picture shows a racked 2U network switch inside of the server rack. There are dimensions listed on each side, showing a 19.7" height , 19.7" width, and a 21.7" depth - perfect for some standard 20x20 HVAC air filters and the box fan needed to turn it into a Corsi-Rosenthal Box.
February 24, 2025 at 4:37 AM