Computerworld - https://www.computerworld.com/article/3282405/data-center/wait-how-can-you-be-unclear-on-the-concept-of-heat.html#tk.rss_all
Consultant pilot fish is called in to deal with this company’s newly installed WAN network equipment. The problem: It’s overheating in a big way.
But the reason turns out to be no big mystery after all. “The client had an old available computer room with a raised floor,” says fish. “But it was quite dirty underfloor, and no cyber-cleaning was considered.
“The new nationwide network equipment and racks were installed. But to negate the problem of the cabinet’s top-mounted rack fans dragging crud up from under the floor, it was decided to reverse the top-mounted fans to push the air down into