For a non-DIY, professional looking, and flat-packable air cleaner that's great for both travel and stationary usage, here's the $150 AirFanta 3Pro: https://amazon.com/dp/B0CJTYWQBT It's capable of box fan amounts of clean air delivery at much lower sound levels, and it takes up less space while being just as good against smoke and viruses. Also, it's perfect for folks who don't want to deal with taping all the edges together or who want something that looks more like a product and less like a project.