They did not.
I lead, and this is no joke, an exciting life at work.
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here's a clip of it clearing smoke from a plastic box. This was a 2min test to see if the fan had enough static pressure to draw through the filter. I sped up the clip so it takes 10sec.
so you can run it off mains power using a USB phone charger, or battery pack. A 5,000maH pack will run it for ~8hrs.
filter is $35 from bunnings, used in multiple cheap shop vacuums. HEPA H13 rated. The design uses a 120mm computer fan (~$35) and runs on a portable power bank, like you charge your phone with.
My favourites tho are these of Bub and her Grandfather.
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