Review on Wathai 120mm x 25mm AC Powered Fan with Speed Controller 3V-12V - Ideal for Cooling Xbox, DVR, Playstation, and Other Components by Danny Poulin

I was replacing a Wathai single speed unit that I had been using to improve ventilation (and reduce heat build-up) in my home entertainment center unit. I bought the first model due to concerns about heat build up in the closed compartment of my Denon AVR-X3700H receiver but found it too loud. This variable speed model allowed me to adjust the speed so that the audio didn't disturb the quiet parts of movies or music. At the chosen speed, I regularly check the top of the receiver and didn't find it uncomfortable to keep my hand in one spot.