...Then again, when you factor in how supernaturally strong the blow-out of a small compartment's atmosphere is in "Disaster", perhaps there's something to Data's suggestion after all?
I guess that we could speculate on the lines of there being enough power to open the rolling door by rolling it (as opposed to, say, detonating explosive bolts) - from which it would follow that there would be enough power and control to do tricks with artificial gravity, which is a notoriously low-power-consumption application (not to mention still working). Perhaps the air was not merely let to leak out, but was shoved out at significant nozzle velocity?
Still there needs to be enough force to move the ship. And it would take a very
large volume of air to shift a 5 million ton mass. In "Disaster", sure, we see it's a large volume of air with a lot of force. But, not so strong that Beverly and Geordi couldn't stay in the room by clinging to a railing.