Is that little fan really effective? I just duck taped a furnace filter to a 20 dollar box fan. No 3d printer needed. Just did this recently actually here's a

Is that little fan really effective? I just duck taped a furnace filter to a 20 dollar box fan. No 3d printer needed. Just did this recently actually here's a pic https://mobile.twitter.com/jonathanfly/status/1215537827565490176 https://mobile.twitter.com/jonathanfly/status/12155378275654...