Seen in the Wild

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The rest of this site has info on ventilation and masks, start with the home page.

This is a variation of a Corsi-Rosenthal box.

It's similar to a HEPA filter, as it uses MERV 13 electrostatic filters which are effective to trap virus particles. Once the room's volume of air has passed thru it 7 times, it is extremely unlikely that there would be enough pathogens to cause an infection

Box Graphic https://docs.google.com/document/d/1qkomA_wq3kvhgUTsOI7-8Vq-qRzqyIc89nIealjoAi0/edit?usp=sharing

I built upon the work of https://twitter.com/robwiss and https://twitter.com/CRBoxKits

Fans are NZXT AER P - RF-AP140-FP - 140mm - PWM Static Pressure Fans - at the time of purchase they were $7 on sale. (note - important that fans are static pressure, and not plain airflow)

They were just connected with zip ties.

Filters are Nordic Pure 16x25x2 MERV 13  - note these were too short, I should have gone with a 20x30 size. The 3M Filtrete in 20x30x1 would have been a better choice.

Power is supplied by a 12V 2A power adaptor 

Distributed to fans via a 4 Pin PWM Fan Hub Splitter Power Supply Cable 1 to 5 Way  - cut cable to attach 2 power leads to adaptor

Just cardboard and duct tape to put it together. The box on the side holds the wallwart for transport. There's a carry strap attached.

Fans are unprotected. Might be worthwhile adding a mesh gutter guard over them,

New info, better fans, more ideas on the next page