Measuring the dust settling -- how long does it take?

A follow-up on my air purifier video, measuring how long it takes for dust to clear from the air on it's own without using an air purifier.
It turns out that different types of particulate have dramatically different settling times. And stirring the air with a fan helps the dust to settle.
This is a follow up of my video about the Dreo air purifier which I talk about at near the end of the video.
Get the Dreo air purifier using this link: woodgears.ca/d...
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Previous video about air purifiers: • Clearing smoke with an...