NMB’s AC Axial Fans range in size from 60mm to 150mm. AC fans feature UV/Wet location cooling fans, as well as IP54 rated fans for harsh environments. 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. The most common AC cooling fan voltages that are available in the United States are the 115 and 230 volt fans.