Guys, Onkyo designed these things and I am sure these units went thru a rigurous QA effort. If Onkyo didn't put any additional exhaust fans on it, it's most likely not needed.
Just make sure you have plenty circulation around and above the unit. I have about 3 inches between my unit and the shelf above. Yes, my unit gets very hot to the touch as well, but I am confident that if you follow the ventilation instructions in the manual ... you have nothing to worry about.
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