I also learned about them just recently. I had to move my printer over in my homeoffice and I was a bit concerned about noise and fine dust, so I looked up what I can do and stumbled across these. Not doing that much about noise, but as I switched all of my printers fans to Noctua ones that’s not a big problem. Big advantage is my prints look cleaner and stick better to the build plate, as it is always at constant heat, even if I open my windows. And I at least think the dust stays in there, as there is no more „3D printer smell“ if you get what I mean :D Can absolutely recommend this.