[throwaway31131]

The fan would move the heat off that given sled but if the channel between the sleds can’t remove that extra heat you probably didn’t help yourself.

My point is the picture doesn’t show any details on the room or what’s outside the rack so it’s hard to know what’s optimal.

[hinkley]

Fans generally are used to move cold air from in front of a rack behind the rack. There appear to be no fans at all here except those in the mini,which would cause the problem you discuss. I’m talking about supplemental cooling with a high volume low noise fan in a 2 or 3u enclosure.