That's what it says in my Jadis manual as well. However, ARC does use fans in some of its models (I think my M-300/Classic 150s had them; that I can't recall entirely will testify that their noise was not intrusive), and I believe they make them for installation in enclosed rack/cabinet enclosures. You might want to check with ARC about this--what model amp do you have, anyway? You could ask ARC if a fan is really necessary for your application as well.
Looking for Silent Fan Cooling f my ARC Tube AMP
I have my ARC tube amp in a corner. I like to stick a fan behind it . The one from radio shack worked great but made a little noise. Any suggestions . Thanks to all !