 and seal up and tape up and put air filters on that. And then I will run that in a room and let that filter the air. And if you put good air filters on there and seal it up really tight on the intake side, it will filter that air. So you can make your own air filter doing that. It works out really well. Just make sure you have a big enough filter so you don't burn up that fan. It needs to have enough air going through there. So you don't want to burn it up and cause fire. But if you build this out,