Queenty air purifier/filter teardown (with schematic)

I thought it would be interesting to take a look at a small home air filter unit with a fairly big pleated filter.
It uses quite a small fan, so it creates enough noise to be annoying if used in a bedroom, unless you wanted background noise. (It helps some people sleep). The fan speed control method is unusual.

A search showed that the replacement filter costs as much as the full unit supplied with one! I wonder if that's just due to the wide range of prices online, or if it's just to hook customers into an ongoing expense.

When I was looking on eBay I noticed that people were selling used units with old filters. Aside from getting a used filter from an unknown environment, you don't know how long the filter has been in use. Others were being sold with no filter, probably because they couldn't get a new one or it cost more than a new unit.

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