Yes that makes sense but right now I’m not sure I remember how that vent looked like exactly: is the vent Gordon has to climb in the only one there, or does the flow of air go into some bigger vent at the top?
At P2, we indeed have suction, but only if the flow goes on towards the right side of the figure. Let’s say P2 is the vent Gordon climbs in, then is there also a way for the air to go on upwards (which would correspond to the right side of this figure)?