Another design is using 2 20x25x1 filters, taping them to the sides of the box fan and then to each other so they sort of make a triangle, then cutting cardboard to make a top and bottom to the triangle.
This was discovered as a more effective design during the 2020 US west coast fires.
Sometimes it’s hard not to feel useless and awful because I’m in pain all the time. It’s hard to remember that those are my feelings not me. I am bigger than my feelings and I am bigger than my pain.
