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I don't think I've ever seen any for air, most I've seen is filtered water.

I think I seen a machine for cleaning the air, but they are rare. Those air filter machines can get noisy, and may cause people to feel stressed from noise pollution.

Yeah they are noisy, I have one at home and it can drown out some music or tv show when it comes on.

At least, most air filter systems have a slower fan setting, so it is not as noisy.

But might not collect the air like it should, better to have it at max.

That is true setting it to max is best for maximum cleaning, I wonder if it would be okay to set the fan to low after the fan is set high for many hours which may of captured a lot of the dust .

Very true and they are very hard to keep clean and easy to forget about.