This repository contains the plans for an air-filter. The filter is intended to filter aerosols from the air, to which the corona viruses can be attached.
Look here for the idea behind this project.
We gave a talk on this topic at rc3. The recording can be found here.
Miriam Busch drew this sketchnote about the talk:
Classroom Air Filter (de) by HHF
Customizable circular mobile HEPA room air filter by Sebastian Ritterbusch