I was looking at the vent in the roof last night for a bit. It is on the Container end of the warehouse. It is large, something like half the size of a car.
If it were to move significant amounts of cooling air out, there would have to be an equivalent amount of air coming in somewhere. Like the a bay door open.
But the bay doors are on the Container end as well. I don't see where enough air enters the Customer area to cool it off, if it is completely walled in.
Edit: Is the stack on the bottom of photo 3 an inlet, or outlet vent? Or a chimney?
Edit 2: It may be a downblast vent/destratifier unit.
Edit 3: Flat roof design. Need both parts, roof inlet and roof exhaust to work. See pics here: https://roofvents.com/Attic-Ventilation-Flat-Roof