So i mentioned this in my play test video, but i thought id stick it over here in suggestions for a more visual explanation
i think it would be best for the player, to use the right most vent coverings only, it keeps things universal visually as a game play mechanic.
my first thought when playing was that the left vent style required something different to open, vs the teachings from the normal vents,
i think its perfectly fine to use the left vent styles coverings on objects that size wont fit a vent size scale, like the end of E1M3 for example. But for ones that are the same size as the right vent style coverings, i think should be used as that universally, to help keep visual game play lessons synchronized throughout.
(and if you wanted to have the right most vent be some what transparent to see what is on the other side, removing a few bars from the 3d model and making two separate model styles might do the trick)
Zortch Brain Need Structure!