Some countries don’t have box fans, but have round fans. “Presenting V1.0 accessible, effective and validated DIY filters using round fans inspired by the #CorsiRosenthalBox. They are the result of international collaboration from designers, engineers and advocates in @TheWHN Airborne… Read More »Round Fan Build – for countries with no box fans.
End goal: Shopping List – the below links may quickly no longer be valid, so including a description of each item. No affiliation with any company whose products I have listed: 20″ Box Fan. Tape. Filters. Build time! Tape the… Read More »5 Filter Build – The Original Corsi/Rosethal Box where the top is a fan, and bottom is a filter.
There are several different builds below. No matter which one you choose make sure you put a shroud on the front of the fan to enhance efficiency. Here is a 4 filter build known as the Compretto Cube: hosted by… Read More »4 Filter Build – A Corsi/Rosenthal Box also called the Compretto Cube. Top is a fan, but the bottom is just cardboard – no bottom filter.
Here’s one as a goal – it’s the same triangle filter as in the video, but with a shroud added for optimum performance, and adhesive contact liner layered over the cardboard. Beautifully done! This was what it looked like before… Read More »2 Filter Build – The Wedge/ The Triangle – top and bottom are cardboard.
Here’s what the final build can look like with judicious use of duct tape. Pretty, pretty sharp: Here’s the actual build from the above Twitter thread. Here’s a more simple, slightly less effective single filter build by aerosol scientist, Dr.… Read More »1 Filter Build – aka single filter strapped to the back of a box fan.
Please see our air cleaner/filter buying guide. Also these tweets are two excellent sources – both from Indoor Air Quality Experts. This is Dr. Shelly Miller – who authored this tweet – and co-authored the tools she mentions here. This… Read More »I just want to buy an air cleaner.
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
“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 »I can’t bring in an air cleaner, but can bring in a fan – got any ideas?
The Corsi/Rosenthal Box is based on a 20″ x 20″ box fan. This is because the size perfectly matches with 20″x20″ filters. Some countries have no box fans. Round fans have been used to build the Corsi/Rosenthal Box. 20″ Box… Read More »Type of Fan
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 »We can only open our windows, but not if the children have to wear a coat? Natural Ventilation…
Next, we are going to make a fan shroud..a fancy way of saying we are going to block off the square corners, so just the round fan is exposed. This was discussed here by Jim Rosenthal. Short version – the… Read More »How to build the shroud
Any type of duct tape is recommended. Keep in mind that you can use the duct tape color to accessorize your DIY Air Cleaner. Please see the Gallery for lots of creative fun ideas.
20″x20″x1″ or 20″x20″x2″ MERV 13 filters are recommended. MERV 13-A filters are available here. Why 13-A? Because they are top of the line. If MERV 13-A filters are not available, the next filters recommended are MERV 13 filters from 3M . … Read More »Type of Filters
This build by Amanda H, has a printed out record label in the middle. This build is simply amazing! Click through to see it in action!!! She was kind enough to provide the files so that you could recreate this… Read More »The Record Player Build
Before reading any farther, even with 2 or 3 portable air cleaners in your space, everyone must wear a mask (more on masks, kids’ masks and reusable elastomeric respirators). Like getting closer to a cigarette smoker, respiratory aerosols get thicker… Read More »Read Me First
Translations by Emily Barnes Franklin – thank you! Click here to go back to all FAQ’s. Click here to go back to all FAQ’s.
Translations by Emily Barnes Franklin – thank you! Click here to go back to all FAQ’s. Click here to go back to all FAQ’s.
Before reading any farther, even with 2 or 3 portable air cleaners in your space, everyone must wear a mask (more on masks, kids’ masks and reusable elastomeric respirators). Like getting closer to a cigarette smoker, respiratory aerosols get thicker… Read More »oldRead Me First
As discussed here, it decreases performance. The 1″ filters are fine – although you would get even better performance with 2″ filters. Just not 1″ filters doubled up.
This build by Amanda H, has a printed out record label in the middle. This build is simply amazing! Click through to see it in action!!! She was kind enough to provide the files so that you could recreate this… Read More »oldThe Record Player Build
Here’s such a letter. It addresses Air cleaner efficacy in general, and the Corsi/Rosenthal Box, in specific. HVAC infrastructure concerns (it will not cause issues). Electrical concerns (will not cause fires). Just emailing it to the concerned individual. Better would… Read More »I need some sort of letter and tactics to overcome objections.
Simple question, complicated answer. First one – assuming you have an air cleaner – the time it takes to do 3 air changes. Source:
20″x20″x1″ or 20″x20″x2″ MERV 13 filters are recommended. MERV 13-A filters are available here. Why 13-A? Because they are top of the line. If MERV 13-A filters are not available, the next filters recommended are MERV 13 filters from 3M . … Read More »oldType of Filters
Any type of duct tape is recommended. Keep in mind that you can use the duct tape color to accessorize your DIY Air Cleaner. Please see the Gallery for lots of creative fun ideas.
Next, we are going to make a fan shroud..a fancy way of saying we are going to block off the square corners, so just the round fan is exposed. This was discussed here by Jim Rosenthal. Short version – the… Read More »oldHow to build the shroud
