What do they do? No hot or cold air comes out of them, ever, with any lever moved, or setting changed.
I'd like to see a picture of that. Sounds like a good ideaI found my left vent opening came in handy when mounting my Gerbing temperature controls and connectors. I popped the vent out and hot glued a panel in its place for my Gerbing pieces. Easy and conveniently located. If the next owners want to, the panel can be easily removed and the vent re-installed.