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An AC (alternating current) cooling fan operates by blowing air along the axis of the fan. The AC fans are available in frequencies of 50 Hz and 60 Hz, as well as varying rated voltages. Standard sizes for an AC axial fan are 60mm, 80mm and 120mm. While NMB manufactures 110 and 200 volt fans, these are most commonly found in Asia and Europe. AC cooling fans are found in a variety of applications where the need for ventilation is important.