If I’m doing woodworking in the garage, we usually end up with a bunch of fine dust particles on our cars in the morning. It has gotten a lot better since I started hooking up my shop vac to all the tools, but there is still plenty of fine dust that escapes into the air.
You can buy some fancy dust filtration systems, but those are out of my budget range right now. So instead I made a DIY version. I bought a cheap box fan and a furnace filter. I attached the furnace filter to the fan with some wire and hung the fan up in the rafters. Now I turn that on whenever I’m woodworking and it helps to catch some of the fine dust particles.
It’s not perfect, but it’s a good deal for the money that I spent on it. I guess you could say it’s “fine.”