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#21
Well Greg IMHO the colder air should in theory at least provide much cooler air to be drawn over the cooling system. I have my room temp at around 24C at the moment and my deskies are all running +/- 2C of that.
I am not sure what you mean by "exhaust pipe" the actual pipe is or should be completely sealed at both ends unless you are referring to the fins that the pipes are running through from the heat sources ie processor and NB to the fan assisted cooler fins.
The pipes themselves I am sure you know already are filled with fine copper "wool / cotton" like strands and have a liquid contained in them that heats up at the yep heat source namely your processors and evaporates to travel the length of the pipe and then condense back to a liquid at the cooler end which returns along the pipe to the heat source and then back again to the cooler end -in an endless loop while the machine is running - ad infinitum.
A couple of refs Computer cooling - Wikipedia, the free encyclopedia &
Heat pipe - Wikipedia, the free encyclopedia <- top part.
The cleaning stuff I mentioned before is put out by Arctic and consists of a cleaner and a purifier that prepares the surface by completely decontaminating the surfaces of both the chip and heat sink. Arctic Silver Incorporated - ArctiClean < I use this religiously.