The hash case with the Delta fans has the miners running in the mid 30's temp wise.  The stock Bitmain fans are running in the upper 40's, a couple units are around 60, so the Delta fans are certainly much better.  However, they are MUCH louder.  Thankfully this is in a datacenter environment so it fits right in and you expect the noise.

The PSU case with all 4 power supplies is running very cool to the touch.  There seems to be no issue with the 4th PSU in the back suffering from all the rest of the hot air from the first 3 moving through it.  Now these PSU's are half-loaded, only 3 miners per PSU at the moment, so we'll see when I can get them set with a full compliment of 6 miners per PSU whether heat becomes an issue.  But with the volume of air that's being pushed through I still doubt it'll be an issue.