I made two Corsi-Rosenthal boxes with MERV 14 filters for my teaching space. The room has no ventilation otherwise so I'm really happy to have these chugging away.

It surprises me how many people don't know what they are or why I'd have them.

#covid #longcovid

https://media.synthwave.social/media_attachments/files/111/070/563/185/253/833/original/862f466f0752bc66.jpeg 

 @13415be2 
My fan is noisy and gets on our nerves after a while, so I’m thinking of trying multiple CPU fans like these…might be better for a classroom: 

https://www.cleanairkits.com/

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