[mreiner]

I like your concept, can imagine it to look quite aesthetic.

Consider you need to create a fair pressure gradient between the two sides of the filter and it needs to be higher the more the filter clogs up. AFAIK radial fans are more efficient for that purpose. Downside is the noise.

If you are running the ceiling fan anyway just for the turbulence it creates on a hot day, it's probably fine even if just a small percentage of the airflow is pulled through the filters, your data certainly looks promising.

[hinkley]

That’s why those filters are full of zigzags. The CFM/m² is very small, and so it can capture small particles instead of them zipping through. Also takes longer for them to clog up. Way longer than the oil change place wants you to think. The test of a dirty filter is that it looks dark when backlit, not when it is covered with surface lint. When they show your your filter, take it out of their hands.