I saw this place that sold old construction equip. I guess they used the roof as a place to store the unit, Kinda odd
"If you've eliminated all other possibilities whatever remains must be the truth."
Looks like no duct work? Their doing their part to help global warming!
they're using it as a down flow; someone stole the horizontal doors.
It`s better to be silent and thought the fool; than speak and remove all doubt.