After using a purifier for two years pretty much non-stop (close to 24/7) I am pretty certain they don't help with dust at all. That's not why we install them, though.

Re: home dust filtration

How can you even search for this? Google results are not relevant to dust at all:

https://www.google.com/search?q=diy+air+dust+filter

This is a really strong example of how bad goog sucks for long-tail queries.

SEO spammed: https://www.google.com/search?q=home+dust+filtration+old+hou...

I've found that tacking 'pdf' onto search queries gets through some of the SEO garbage. For instance I did 'home dust filtration pdf' and found this pdf:

https://www.epa.gov/sites/default/files/2018-07/documents/re...

which cites this paper about deposition rates of different particle sizes:

https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=86094...

> How can you even search for this? Google results are not relevant to dust at all:

Try this: https://www.google.com/search?q=diy+air+%22dust+filter%22

I have a couple of blu air purifiers. They really cut down on the amount of dust in the room. We used to have to dust weekly, in the rooms where we have the purifiers we dust maybe every other month now and you can't tell a difference.

Since this describes such a different experience from my sibling comment, I'll have to add that my purifier cleans particulates just fine (close to 0 µg/m³ in summer and 20-40 µg/m³ in winter), which is supported by three separate PMS5003 and a couple of years of data piped into Grafana.

I don't know why it's so useless against dust. Maybe we have more coarse-grained dust which quickly falls down on the ground.

The blu air filter has a prefilter specifically for dust and it gets filthy. That has to get washed in the laundry regularly. Maybe some combination of that, it's cfm's and placement might make a difference?

I have 2 coway units in a ~800sqft apartment and still have tons of dust but I open the windows a lot when its not smoky and I have a dog so who knows. The pre-filter does trap a lot of dust so there is obviously some (maybe minor) reduction.

There is still apparent dust after years (have cats) but OMG the filters get gross.