Just got back from the dentist and noticed he was using a localised extraction device.

It's for extracting aerosols from the vicinity of a procedure (medical or dental) and filters down to 99.99% @ 0.1 microns so can remove COVID causing virus and other viruses. The nozzle is located near the aerosol causing source and sounds like a quiet Vacuum cleaner.

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Interesting to see the slightly flared nozzle.
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As to be expected for medical gear, at $4k a pop no I won't be buying one!