The oven vents I've seen on TTs (and motorhomes, too) all have flaps that open outward. On my past TTs it was a simple plastic finger that rotated against the vent to prevent it from opening. To open the vent you simply folded that small finger out of the way to permit the flap to fully open.
Now, that doesn't exactly sound like what you are describing. So, it may not apply at all.
Why not test it? Turn on the range vent and go outside and check for good air flow in various configurations. Make sure the filter in the range vent is passing air effectively, too. Turn on the vent and put a piece of paper up against it and see if the vacuum force holds the paper to the vent.
2017 Winnebago Adventurer 37F
2016 Lincoln MKX Toad