WAIT, be sure to monitor the power requirements on the "cold boot" factor, a lot of the tornado fans require more power, which 90% of standard fan controllers cant handle on there little PCB, heres an example problem that I had:
The FFB1212EHE is really powerful. It has a 3 amp startup and a 2 amp sustained power draw at 24 watts...its a 120mm Delta fan that blows 190CFM, which is a LOT of freekin air, and at the cost of your ears. Speed regulators "can" be used , BUT you need a very powerful one. The only reason most companies have not stocked these products is due to cost.
Digikey is where I typically find such potentiometers, and the price per unit is over $45. Its hard to justify that when people can buy a fan controller for nearly half as much. But for this type of fan, its required, no fan controller can handle it without blowing a channel, or having some severe static noise from "almost" overloaded circuits.
Take a look at
www.digikey.com and look for rheostats and potentiometers. Most units for sale, like vantec, enermax, asus, coolermaster , are a 5 watt job. It can't handle the power draw of the 1212EHE, or nice powerful fans that have a startup amp pull of over 1.5 watts. It may last a month, maybe 4-6 even, but eventually your looking at that thing as a risk of frying, and possibly taking out anything else connected to the same molex line its on. so choose wisely
