I looked into some rack cooling options, but was unable to find a solution that would provide the amount and wide coverage of airflow I needed to move air slowly and uniformly through the rack to provide effective cooling. ( I was designing this to be used with the active cooling rear doors, so I couldn't overwhelm the door with too much air or it wouldn't cool the air effectively, and would raise the ambient temp of the room). So the fans move a high volume of air through the entire cabinet (including the corners) at low velocity resulting in very effective cooling of each of the 40 shelves.

The fans are large so they move a high volume of air at a low speed, the door doesn't move is left unlatched.

Also, can you please explain your "Massive Fire risk" comment? All of the hardware installed in this rack is UL certified and all of the machines will simply shut down if they get too hot.