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.
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.
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?
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…
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.
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.