They would slide out on a tracks; you could choose a standard screen, or a hepa filter and/or a charcoal filter. These would then swing down to change out, kind of like the windows that swing in so you can clean the outside. There’s also an idea for blackout options: bsky.app/profile/yesl...

See I want screens made out of synthetic spiderwebs or something that would do all that without my having to remove anything. :)