Amplifier Fan

I have a Rotel RB-1090 amplifier which is a dual monoblock rated at 380W per channel. It sounds wonderful, particularly at high volumes. The thing is, I admit I do listen to my music very loudly and have been known to go for hours on end at this high volume. This often forces the Rotel to heat up too much and engage it's protective shut down protection.

I bought a 14" air circulator from my local hardware store and put it right on top of the amp, blowing down into the vents. This solved the problem in spades.

However, the fan is pretty loud which can be extremely annoying during the silence between tracks and in softer musical passages.

Does anybody know of an ultra-quiet yet strong and effective fan? I'm open to any and all suggestions.

By the way, the amplifier is completely unobstructed and has very adequate ventilation. I also just had dedicated lines installed for all of my audio/video components which may help with this problem. But my thinking is that I need to use a fan regardless.