This is not a SFW instance. NSFW communities will be tagged, and efforts will be made to keep SFW communities clean, but proceed at your own comfort level.
so that air can flow in and out of different sides of the same window, instead of having to have two windows, one with air flowing in and the other with air flowing out
Trying to iimagine a fan with blades in different directions…
Window fans have two sets of fan blades side by side. They can spin in opposite directions.
Why?
so that air can flow in and out of different sides of the same window, instead of having to have two windows, one with air flowing in and the other with air flowing out
Oh, so it’s effectively two independent fans. I misunderstood before.
I too was imagining an overlaid set of counter-rotating blades