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RE: AC & DC fans and quietness
It is worth noting that the speed of DC brushless fans can be
controlled by varying the voltage, which means you can more easily
change them to a lower or higher speed. To the extent you can run
themn slower, you run them quieter. So if you sometimes need a 50 CFM
fan but sometimes need nly 30 CFM, a DC brushless, with approriate
speed control could be quieter than an AC fan that runs at 50 CFM all
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