Attaches to an air vent to prevent the air from blowing in an undesired direction. Uses magnets 5mm diameter, 3mm tall. 

I used these magnets:
https://www.amazon.com/gp/product/B08DNH63JV

You can also use the included CAD file to change it for magnets you have on hand or make it so it uses double sided tape. 

I've use these in my bedroom to stop cold air from blowing right on me. I've also used it in the bathroom to prevent the vent from blowing air right into the shower. 

I've included a the fusion360 file so you can tweak it or see how it was made. Feel free to do what you want with it!

If you make one, I'd love see it!