It's a really small switch in a metal case. Plenty of holes to allow for air flow.
It sits on top of my NetGear DG-814 Router and it acts as an up link for the addition computers / nodes on the network. One of the nodes seems to be on Kazaa 24-7 at full speed, and I have noticed that the switch itself is about 20c when i touch it.
Should I be worried?
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20 degrees C is totally normal. You should be concerned if it reaches 40C and above. Then it just might be time to get a replacement switch. 8 port switches are very cheap these days.
My 8xPort Switch is hot, should I be worried? 
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