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When nonprofit staff are paid so low they qualify for their org’s services

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A while ago, at the request of some colleagues, I talked about “Nonprofit Math” and created a little video that...
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rocketo
5 hours ago
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seattle, wa
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DIY box fan filters – Corsi-Rosenthal box - Clean Air Crew

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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!


Image / Video Gallery

This gallery includes photos of builds, creative modifications, instructional images, as well as videos. Click through tags below to load more.

corsirosenthalbox blank background

Video: How to effectively ventilate classrooms using fans, HEPA filters or Corsi-Rosenthal box fans and monitors

Cleaning indoor air properly greatly reduces infections by airborne viruses, like COVID-19. This video explains it all very well!


How to build a Corsi-Rosenthal box fan filter

Start here

A Variation on the “Box Fan with MERV 13 Filter” Air Cleaner Article by Jim Rosenthal

Read about it in WIRED: https://www.wired.com/story/could-a-janky-jury-rigged-air-purifier-help-fight-covid-19/

Construction Guide:

More details, including filter brands to avoid, here: encycla.com/Corsi-Rosenthal_Cube (by Philip Neustrom)
(hint: Filterbuy MERV-13, prevalent on Amazon, have not tested well)


Illustrated Guide

by Amanda H @ughberta

The Fan Shroud

An optional part of a box fan filter is the fan shroud, or covered fan corners. Covering corners of a square box fan closes gaps and improves efficiency of the fan. See Jim Rosenthal’s article about it here. Use cardboard or duct tape.

Testing to optimize fan shroud size. David Elfstrom found a 13.5 to 14.25 inch diameter opening to work best with a Utilitech brand fan. Lasko fans work best with a 15 inch fan shroud.


Choosing filters

David Elfstrom advises “keep an eye out for local sales on the 20x20x1 or 20x25x1 Filtrete 1900 and box fans

To build with 2 inch deep filters, use (3) 20x20x2 and (2) 16x20x2

You can order a full set of high-quality MERV13 filters to make this air purifier here: https://www.texairfilters.com/filters-for-box-fan-and-merv-13-filters-air-cleaner
These 2 inch deep filters (compared to typical 1 inch) provide greater surface area for filtration, better air flow, quieter operation, and longer filter life.


Performance

The Corsi-Rosenthal box (single filter tested, full cube would be even better!) performs very well! It is the most cost effective air cleaner on Marwa Zaatari’s chart!


From Bill Bahnfleth, Chair – ASHRAE Epidemic Task Force

source: https://twitter.com/WBahnfleth/status/1469454061225316353?s=20

source: https://twitter.com/WBahnfleth/status/1469781099043864583


CR Boxes in Johns Hopkins “Ventilation: Vital Tool to Reduce Spread”

source: https://twitter.com/MarinaC_Dyb/status/1469469896664829952?s=20


Round Fan alternate design

Not all parts of the world have box fans available. This international team has worked out an alternate design using a round fan!


Travel DIY Air filter


Modification: Screen as “prefilter”

This modification, adding fiberglass screen material, can keep pet hair out of filters and prolong their useful life, with barely noticeable flow reduction!


FAQ – Frequently Asked Questions

New comprehensive FAQ page here!

Also, tons of details and FAQs in this excellent comprehensive thread by Lazarus Long.


Video: Box Fan Filter build tutorial – Spanish

source: AleHSalcedo2

Video: A Fourth Grader Explains How to Build a DIY Corsi/Rosenthal Box Air Cleaner

source: @gbignami

Watch more videos


Mass production!

Check out how Rosie @BkPhilanthropy assembled and distributed 100 air filters!

Download the printable PDF of the insert they included with the filters!


Dr. Prather with UCSanDiego


Brown University
Students unite to take a hands-on, DIY approach to improving air quality

An event hosted by Brown’s School of Public Health brought students together to build low-cost, highly effective Corsi-Rosenthal cubes as air filters that will augment existing filtration systems at Brown.

www.brown.edu/news/2021-11-19/diy



Common concerns addressed

Developed by @amandalhu, this interactive PDF addresses common points of confusion around air filters.

Rebuttal Matrix for Advocates of Air Filtration in Schools Based on Common Barriers


Find more tweets about this:

Box fan filter
#corsirosenthalbox
#CorsiRosenthalBoxes
#CorsiBox
Corsi Rosenthal box


In the news:


3M scientists: This Corsi-Rosenthal box movement is legit

Scientific American: We Need to Improve Indoor Air Quality: Here’s How and Why
Upgrading buildings’ ventilation, filtration and other factors would not only decrease COVID transmission but also improve health and cognitive performance in general

CBS News: New air purifiers filter at least 90% of COVID-carrying particles, researchers say

WIRED: Could a Janky, Jury-Rigged Air Purifier Help Fight Covid-19?

DIY Air Filters For Classrooms? Experts Are Enthusiastic — And A Citizen Scientist Makes It Easy

Smithsonian Magazine: The Homemade Air Purifier That’s Been Saving Lives During the Covid-19 Pandemic. Made from everyday items found in hardware stores, the Corsi-Rosenthal box is a testament to the power of grassroots innovation

UCSD students, staff build filtration boxes to prevent spread of COVID in classrooms

NBC News: What to do if a family member tests positive? How to ‘Covid-proof’ your home. The best strategy for avoiding the Covid virus is to make indoor air as much like the outdoors as possible, experts say.

Brown University: Students unite to take a hands-on, DIY approach to improving air quality. An event hosted by Brown’s School of Public Health brought students together to build low-cost, highly effective Corsi-Rosenthal cubes as air filters that will augment existing filtration systems at Brown.

UCDavis: The Corsi-Rosenthal Box: DIY Box Fan Air Filter for COVID-19 and Wildfire Smoke

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rocketo
17 hours ago
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now that the entire u.s. is susceptible to wildfire smoke (and covid, still), seems like a worthy project
seattle, wa
fxer
1 day ago
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Ooo might have to build one out of my spare box fans
Bend, Oregon
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My Mother’s Letters Should Belong to Me — Not a Company That Works With Prisons

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JPay, the messaging system for incarcerated people, knows more details about my life than some of my closest friends. Most of my 3,966 emails are from my mother: encouraging me in my faith, and in others, chastising my perceived “sly” comments. As her adult child, it’s hard to maintain a line of independence, especially because I’m so dependent on her for support. Our correspondence over the past...

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rocketo
2 days ago
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seattle, wa
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fpu

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May be an image of text that says 'REMINDER: April is Procrastination Awareness Month:'

like ffu but in hindsight
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rocketo
2 days ago
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seattle, wa
jhamill
2 days ago
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California
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The WHO Ensured They Had Clean Air and Ventilation While Telling the World Covid was Not Airborne

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Like most of us - I’m feeling hurt & betrayed by the knowledge that the WHO quietly upgraded their ventilation & air quality while pushing droplet dogma to the masses. They knew it was airborne & only protected themselves. 

Let’s face it - we’ve known for a long time that many governments and people in positions of power have been taking more Covid precautions than they publicly admit. They downplayed the risks to the average Joe while using as many layers of protection as possible for themselves .

The World Economic Forum in Davos was perhaps the best example of this - where attendees had access to PCR tests and state of the art ventilation and filtration to lower their risk of Covid. Clean air for me but not for thee. 

Despite this not being new information - the WHO news hits extra hard. These are the people who are supposed to be overseeing the literal health of the world. Keeping us safe, advising us of risks, educating us on prevention. 

Yet they pushed droplet dogma for FOUR years - and people died or were left permanently disabled. They allowed bad science like cloth masks & 6 foot distancing requirements to proliferate while taking actual airborne precautions for themselves.  

They quietly walked things back a few weeks ago and finally (albeit unenthusiastically) acknowledged that Covid is indeed airborne (while changing the definition of airborne). The problem is … who’s going to listen to them now? The guidelines have made no sense for 4 years and their credibility is severely damaged. 

So I’m mourning. I’m mourning the thought of what could have been. If the WHO had admitted it was airborne & advised governments to take the same precautions they were taking for themselves … how many lives could have been saved? How many people could have avoided disability? 

I’m also mourning the loss of trust in our public institutions and science. It’s having a downstream impact on health the likes of which we’ve never seen - and I fear it’ll only get worse. And it’s all too easy to understand how we got here. 

If the “experts” tell you that a cloth mask, sanitizing groceries, washing hands & standing 6 feet apart will prevent spread of COVID …. And you get Covid anyways … you’re going to distrust them. 

If you followed all their rules only to find out they took far more precautions for themselves? You will distrust them. 

If you rushed out to get the vaccine and happily went vaxx and relax only to become seriously ill and disabled? You will distrust them. If you’re independently following the science and know that a respirator and clean air is necessary for prevention? You will distrust them. 

The guidance we’ve received since the beginning of the pandemic has almost always been wrong. And no one has stood up and admitted that. No one has said sorry. So we see more and more people distrusting public health, ignoring the science & endangering their health. 

I don’t know where we go from here but I know that it’s going to take a lot for people to get over the betrayal they’re feeling right now. Just like it’ll take a lot to undo the damage done and squash the rising anti-science, anti-vaxx movements that are growing the world over. 

But we have to try. Literal lives are at stake. People are still dying and becoming disabled every day - and we know that risk goes up with cumulative infections. In 5-10 years there could be very few people left who aren’t experiencing long term health consequences. 

I wish people in postions of power like the WHO would publicly say “we’re sorry - we got it wrong.” I genuinely think it would go a long way. People need to hear them say the actual words…. And apologies can do wonders for healing trauma. There’s much healing to be done. 

Until that day - I hope and plead with people to continue following the science and advocating for clean air, better vaccines & treatments, respirators and a layered approach to Covid. It’s unfortunate so many of us are doing the job of public health - but it’s necessary. 

Days like today it might feel impossible - the pain & anguish too much to bear. But never lose sight of the fact that there are people out there who see and appreciate what you’re doing. Who wouldn’t know how to clean the air or choose a respirator if it weren’t for YOUR advocacy.

Regular people on social media may not be changing policy at the public health or government level (yet)… but that doesn’t mean we aren’t saving lives. Even if you only reach one person… that’s one person who might avoid death or disability because of what you shared. 

So keep up the fight. Call out injustices when you see them - but then refocus on the message at hand. Covid is airborne. It’s not over. It causes devastating Long Covid. The best way to prevent it is a layered strategy that includes clean air & respirators. We can do this.

Thank you for reading The Disabled Ginger. This post is public so feel free to share it.

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If you want to learn more about the Covid pandemic and agree that some of the best information comes from people donating their time and energy and sharing on social media - there are a few excellent SubStacks I want to recommend. All of whom have inspired me to write more on the subject of public health and Covid - but who’ve also been integral to helping me keep myself safe throughout the pandemic.

writes some of the best Covid journalism I’ve found. Her pieces are always timely, accurate and tackle issues that mainstream media seem unwilling to discuss. She recently wrote about the WHO changing the definition of airborne (and the lives lost due to their refusal to call Covid airborne in the first place).

first landed on my radar via twitter/X - and writes about the pandemic, public health and issues of social justice. Recently he wrote one of the best pieces I’ve seen on Paul Alexander’s passing - the last man in the iron lung. 

writes about the pandemic, climate change and being a prepper/doomer. Her posts are always insightful and challenge me to look at things in a different way.

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rocketo
4 days ago
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seattle, wa
sarcozona
4 days ago
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Epiphyte City
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The Do-Nothing Farmer’s Guide to a Perfect Harvest

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I discovered “do-nothing” farming in my reading of Masanobu Fukuoka, author of One Straw Revolution and one of the pioneers of natural farming and permaculture. After farming for six years with his words in my heart, I have found that Fukuoka’s “do nothing” does not mean an absence of action. Rather, it is an active and committed practice of mu—emptiness, negation.

Here are four of the lessons I have learned as a “do-nothing” farmer. These can be applied to any agricultural project, whatever the size, from a tiny veranda garden to a large farm with many acres. In fact, with some adaptation, they can be applied to many of our activities in life.

Lesson 1: Spend Time with Your Plants

My farming day starts before dawn with zazen meditation. While counting my breaths, I put myself out there with the new seedlings, hovering over the beds, fertilizing them with my presence.

I begin the outside part of my day by slowly and deliberately walking through the fields and beds. I make note of something new every time: a fresh bit of growth, an insect that has just returned for the season, a place where a varmint has nibbled, the first setting on of fruit. In the evening, I walk again and note more changes, for the early garden and the late garden are very different things. These endless changes are the steps of our dance through the wild world.

Lesson 2: Build the Soil from the Top Down

I build my farm’s soil from the top down, as nature does. I layer on sea minerals, animal manure, and rice hulls, followed by a heavy mulching of straw. A few months later, I turn the straw and repeat. When you’re working from the top down, a certain patience is built in. The microbes below do their work over time, and the process cannot be hurried or completely controlled, only assisted.

Building soil this way invites introspection and meditation. It is the scenic route, the long detour, but the reward is living soil that you can thrust your hand into if you wish—tender, fertile, lush plots full of life. In do-nothing farming, the soil is your host. It’s better to find a place among the assembled guests rather than take a leading position. This giving up allows you to see things much more clearly.

Lesson 3: Create a Space that Fosters Life, and Welcome All Life to It

In my gardening, I strive to create a space that welcomes and fosters all life. As a result, all life assembles there, whether “helpful” or “harmful” to my harvest. Field mice will come to snack on the young greens and turnip tops. A groundhog may make a home for her family right in the middle of the pumpkin patch. Insects you have never seen before will make weekly debuts throughout the warm months. This is a testament not to failure but to success, for the well-populated organic farm is a triumph.

We may garden with the goal of harvesting perfect heads of broccoli, using all manners of pesticides at the slightest sign of danger. But in the practice of nothingness, accepting what broccoli comes is the most honest way I know to interact with the land. After all, insect damage is a mark that the vegetable is also a living thing, a part of the whole biological world. We can learn more from partly eaten broccoli than from perfect heads.

Watching the cycle of life and its testimony to life’s transience is one of the greatest lessons of the fields. I have learned to watch for and cherish the vegetables, vines, and trees that want to be here. Fukuoka writes, “Do not ask what to grow here, but what grows here.” Listen to the seasons, smell them, feel them on your skin, and watch what each one brings.

Lesson 4: Lose the “-er”

I try to farm without the “-er” in farmer, to garden without the “-er” in gardener. What this means is to practice horticulture without putting yourself in the center of everything. Take note of how much farming happens when you’re not there and don’t overestimate your importance to the project. The best place to farm is outside yourself.

I strive to farm with a sense of presence rather than dominance. Many of our gardening tools and concepts are based on some variation of dominance: weed and pest control, the tiller and spade breaking the “uncooperative” soil.

The 100-foot row ahead can seem endless. But I keep my hands moving, one weed at a time, and each moment is a success.

My own farming passed through various iterations of the dominance model until I realized that abandoning myself was perhaps the best approach. Since then I have farmed without being a farmer. Be a presence on the farm for the time being only. Farm as if you were already gone.

One way to lose yourself is to farm in silence, without machines, listening to the soil. Farming with machines limits your experience to that single-frequency hum, blocking out the real signs of life.

Another way to lose yourself is to keep your hands moving from the beginning of the day to the end. Small tasks are just as important as large ones. The goal is not to be blindly busy, but to let the action of the hand take over from the control of the mind. Time your work so it fills a day completely without overflowing. Learn the rhythm of every task on your farm and follow it like a back beat in a jazz ensemble.

Action should be considered, but once considered, pursued purely. When I am weeding a new bed, the 100-foot row ahead can seem endless. But I keep my hands moving, one weed at a time, and each moment is a success. Similar to Thich Nhat Hanh’s “washing the dishes just to wash the dishes,” I weed only to weed.

Do-nothing farming is the practice of watching and observing, of waiting and removing yourself from the equation. The germination, the growth, the harvest—I have no hand in these. In the end, learning to do nothing has been my greatest challenge and most valuable lesson.

The post The Do-Nothing Farmer’s Guide to a Perfect Harvest appeared first on Lion’s Roar.

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rocketo
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