There was a post a moment ago from SirBlastAlot mentioning that his receiver gets warm. Heat is absolutely, positively the enemy of electronics. I've lost some expensive video production equipment to problems with capacitors that were caused by heat issues.
I use this
fan from Brookstone on my external FireWire drives and it's fantastic. A bit pricey, but it has 10-12 variable speeds I believe and it is quiet, quiet, quiet. If you have an AVR that runs hot when your crankin' it, I guarantee you would never hear this fan if you put it on… matter of fact, you won't likely hear it on one of it's middle to low settings from across a quiet room!
