@RJC: All these months/years I thought it was a some sort of ventilation duct to remove heat from your PC!![]()
Ha ha


RJC's lying. He's a government doctor, and he uses that as a torture colonoscopy...
Can you imagine the pain??
Otherwise I still don't have a clue.
My eyes watering reading that!!!

The unit chills water which then gets pumped round the building through fan coils to keep the occupants cool, there are 4 of them, in the summer all 3 run with one as a standby.
At full load the unit is about 2mw cooling.