askchapo

For the air filters, the lowest cost but least effective is to literally just tape a square/rectangular filter to the intake of the fan, turn it up a notch, and put it in the room you spend the most time in or that gets the worst of it.

More effective is setting up a Corsi-Rosenthal box with the fan, a few filters, and some duct tape.

After that, you can buy something like a cheap a Levoit purifier with the smoke filters. Sorry for Amazon link. I use one of these though and turn it up to high on days when the smoke is bad, but just run it 24/7 on low otherwise.

For real big ones, you usually need to mount them in the window and have large ducts/block off the rest of the window, etc. They're way more expensive and complicated/limiting. More effective too, but only marginally so over something like the Corsi unless you live in a very large space.

For hair in the drain, a dollar drain catch like this is great.