HVAC vent deflector

I made a 1-piece vent deflector, to use in place of the commercial 2-piece Clear PC deflectors.
Quickly realized that the commercial ones only fit the 4x10 and 4x12 vents (USA/NA sizes). Where I planned to use them was the 6x10.
Anyway, I made up the 4 most common sizes; 4x10, 4x10, 6x10 and 6x12.

You will need 4 10mm dia 3mm thick magnets per vent.
You can use ones with counter sunk holes. There are holes in the magnet pocket for screws if you go that route.
There are 6 magnet pockets, if you feel you need it to hold on the vent better you can add the extra 2 magnets.