How about moving the server on a shelf over my kitchen sink?

So, on a more serious note, I've been observing temps, of course, for few days - 12cm fan and no side panel.

They did not stay at 29/30. They increased up to 33/34 (please notice how the delta is almost constantly 1 °c between the two hdd), to stabilize more or less at 31/32 . My best guess is that it depends on the environment temperature. I am now curious to see how the hot Rome summer would affect the system (of course, I'll turn on AC at some point, so...).