Hi all!
This evening I was talking with the local barkeeper about commercial air purifiers like Dyson, Xiaomi and Rowenta, he told me that he's happy with the first brand. In particular this kind of device seems working with dust and allergens, inside home.
Looking for commercial products I saw insane prices for units and (above all) for filters replacements. At first sight, it seems a normal, silent, low power fan with a manifold and a sort of Hepa filter (some models with activated carbon).
The idea was to try the operation with a diy simple prototype with car or air conditioner filter, I was curious if someone already tried with satisfaction this solution

Thanks
Stefano