I believe the fans are actually smaller. The rack is definitely quieter than other racks, but he says in the rear rack tour that it's quite hot. Check out these videos of it

[0] - https://www.youtube.com/watch?v=dHbgjB0RQ1s [1] - https://www.youtube.com/watch?v=lJmw9OICH-4

The fans are 80mm, traditionally 1U is roughly half that size.