I wish i could get my hands on a ViP222 top cover with all the slots in it. It looks like a grille. The ViP222 has the same housing, so therefore the top cover should fit on the 622. This should help with heat going out of the unit through the top. I don't understand why they used a cover like that whereas a 222 has all those slots in there and doesn't employ a hard drive like the 622. Also any other electronic device that generates heat, like amplifiers have slots everywhere in the top cover. Don't tell me it's because of dust, because that fan in the 622 acts like a vaccum cleaner and sucks all kinds of crap in there and blows it straight onto the hard drive. And the fan in MY 622 runs ALL the time. You can see it running looking through the air intake on the right side using a flashlight. This is the 3rd 622 I have and all 3 of them had it running all the time. it doesn't run on full speed though. My 622 is sitting on top of a cabinet with several feet of airspace surrounding it, and keeping the room temperature at around 76F. Average temperature is about 125F, and it's been the same on all three units I had. (B, C and now E-series)
Ever opened a PC after having it for a year or so, to see how it looks like in there? The far left corner of the 622 is extremely hot too. That's where the power supply is located.