I recently purchased a stand for my LCD tv that houses all of my other components, including my 722. Afer watching the Lord of the Rings movies this weekend & having my surrond receiver on, the 722 was pretty warm. I would like to install a small fan to prevent overheating of the 722 & my surrond receiver. Should I try the USB type or the type that I can plug into my electrical outlet? I really don't want one that runs all of the time. It must be quiet. Ideally, it would only run when my surrond receiver is on. That seems to be when the 722 is overly "warm". Also, which direction should the fan blow.....or should it be an exhaust?