Quick Tip if your windows and doors open – at the VERY LEAST, open during breaks and lunches. Source: “If its cold, crack the windows rather than opening them fully and then open them wider to air the room periodically… Read More »oldWe can only open our windows, but not if the children have to wear a coat? Natural Ventilation…
It is recommended not to – the virus might be on the filters – but It is far more likely that airborne transmission will occur. The odds of transfer from the filters to the hands and then to the mucosal… Read More »How to keep little fingers out of the filters? Or – can students touch the filters?
This is a great question! Two part answer. First part is that it’s actually two different technologies. Bulbs are usually used to clean items in a sealed container in a hospital. Hospitals use UVGI to clean the air. And it… Read More »Wouldn’t it work better if we added UVC bulbs under the shroud like hospitals do?
Maybe 🙂 . This is page is really just a collection of ideas to help inspire YOU. It was conceived as a combination of physics (aerosols), biology (lungs), and math (large number conversions). All parts are meant to be used… Read More »Science Project – do you have any ideas?
Laborious Experimentation – drop him a “like” on Twitter! Scroll up on this thread to see his excellent work! And this optimization thread (scroll up):
“Lasko FF305 Air Flex 2-in-1 20-inch Box Fan and Air Purifier in One with MERV10 Air Purifying Filter” Won’t be as good – but something is better than nothing! The filters here are 13-A – so I would buy one… Read More »oldI can’t bring in an air cleaner, but can bring in a fan – got any ideas?
They get it and transmit it. They have ACE2 receptors, which SARS-COV-2 targets. And just like adults, they have a thermal plume wafting SARS-COV-2 up to you. Basically, our body’s own heat forms a never-ending plume of air movement upwards… Read More »Regarding putting these in classroom – I thought kids don’t transmit CoVid?
This could not be farther from the truth. Air cleaning is additive – not subtractive. For example – hospitals have excellent air cleaning. In this preprint of a study – “A single bed hospital room equipped with an excellent ventilation… Read More »HVAC – someone said it will mess up the HVAC of our building?
Better. NYC’s CADR for smoke was 129. The Corsi/Rosenthal Box CADR was 132. And that was with MERV 10/11 filters. The Corsi/Rosenthal Box should be made with MERV 13 filters, so will test even higher. These measurements are in process.
No: Measured by Underwriter’s Laboratories, Inc. Smart Air has been doing the same thing since 2013 – only 5 had issues, most likely issues with the fan motor itself, not the load. There were no actual fires.
That study did not include the risk of reaersolization (blow back up in the air) of dried respiratory aerosols that will have settled on the ground. You will give a little in efficiency to gain safety. http://poppendieck.com/IAQ/COVID19%20FAQ.html
Sure, they are. They have to be to enable you to breathe. But – if you catch CoVid, you literally drown in the mucus created in your lungs. Speaking of drowning – your lungs process over 2,000 gallons of air,… Read More »But my lungs are tough! (A quick discussion of how much work your lus do )
Yes – it removes aerosols from the air. How well does it work? Very well. “It is the most cost effective purifier on the chart.” – this evaluation is from Dr. Zaatari, who regularly publishes an easy-to-understand chart that simplifies… Read More »Does the Corsi/Rosenthal Box work?
Because they have been studied, and found to be very effective at removing aerosols from the air: Classrooms: “…our study shows that box fan air cleaners can serve as an effective low-cost alternative for mitigating airborne transmission risks in poorly ventilated… Read More »How do I know air cleaners even work?
Won’t a portable air filter (cleaner) just move the air with contaminated aerosols around to infect more people?
Per Dr. Poppendieck “I actually love this question because it shows the person has thought about what we intuitively understand about our indoor environment. We generally don’t feel the air move indoors. Humans can sense air movement down to about… Read More »Won’t a portable air filter (cleaner) just move the air with contaminated aerosols around to infect more people?
SARS-COV-2, the virus that causes CoVid, is actually carried by respiratory aerosols. Portable air cleaners (also called air purifiers and air filters), work by pulling air through high-quality filters. As the air cleaner pulls air in with the fan contained… Read More »Why use an air cleaner? The air doesn’t look dirty, and I can breathe easily?!
Put on your N100 elastomeric respirator (more comfortable than N95). Does not have to be N100 – just better masks work…better. Carefully, pick up the Corsi/Rosenthal box and gently take it outside. Carefully cut the filters apart, gently peel it… Read More »How do I dispose of the filters?
I’m sorry, you do still need to wear a mask. Why? For the same reasons Health Care Workers continue to get infected in hospitals which have excellent ventilation with 6 Air Changes Per Hour. Ventilation cleans up far-field aerosols (>6… Read More »Do we need to wear masks even though we have a couple of air cleaners?
Always refer to the manufacturer’s specifications. But a general rule of thumb is: If used during smoke season, 3 months. If during regular usage, 6 month. Additional details on MERV 13-A filters which for sure will are the ones that… Read More »How long do the filters last?
You can build one of these for just under $100, and it will help significantly remove respiratory aerosols that contain SARS-COV-2 from the air. We recommend at least 2 of them in a normal sized classroom. $200. Keep in mind… Read More »How expensive is the Corsi/Rosenthal Box?