Hi, Gang I'm about to replace the fan in one of my amps. It is the standard sized "boxer fan" type, approx 4.5" square and 1.5" or so thick. Noise has always been an issue with these things, so I'd like to make it a bit quieter than it is now. Changing the style or size is not an option this time. Which brands and models of are the quietest? TIA. 73, Charles - K5ZK