Yeah, I'm thinking a warehouse with two large garage doors rather than one so I can do something like intake for one door, have the miners lined up in the middle, exhaust for the other door and create a "U" if I were to visualize the airflow.
One space I was looking at to move my operation into was a smallish warehouse with a garage door on each end (part of a "warehouse/shop" building complex).
The primary reason I decided against it was that there was no "man door" at all, and my knees don't handle stairs reliably any more - both garage doors were at "pickup/semi trailer" height.
Airflow would have been trivial to set up though - louvered "inserts" under each door and straight-through airflow.
Ah. Yeah if I go with a warehouse it must have not only the large garage doors but a small standard sized one as well, because I'm trying to come up with a solution to stack fans on top of each other to maximize the space of the door and not just have one row of fans on the floor. I would find a way to chain them all together along with the door to the ground, so you wouldn't be able to get in or out of the large doors for better security. I'm sure there is some industrial fan out there that is meant to be stacked for what I'm looking to do. If anyone has heard of anything like that, post it here!