Looking for Silent Fan Cooling f my ARC Tube AMP

Vornado Zippi totally silent. I was using it when I was keeping a tube amp in a rack with somewhat limited shelf space. I had the fan blowing upwards over the top of the amp so the heat would blow out the side of the rack and not heat the upper shelf too much. Worked perfectly.

I find pro cool fans are very quiet.
Some assemblies have a thermostat so she'll kick in at a certain temp and off as well at a certain temp.
I use two and I can't hear either of them.
Also there is a temp display.

Try End PC Noise for a wide selection of quiet fans. I have one I got from them mounted to the back panel of my HT system cabinet running 24/7 and it is inaudible. I power the fan with a 12V wall wart. Two cable boxes in the cabinet alone generate a substantial amount of heat around the clock, and with closed cabinet doors, I need to get rid of the heat buildup.

http://www.endpcnoise.com/cgi-bin/e/std/category=Quiet_Case_Fans.html

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A comment that uses extreme brevity and a hint of irony is a "micro crack". Also, fans have been cooling tube amps in one way or another (suck? blow?) seemingly forever, and this is the first I've heard of micro cracks...I'm suspicious...I'm going to be looking for these everywhere now..."Hold still Marge...you could be standing near a tube with MICRO CRACKS"...