FAD1 DC Axial Fans Qualtek Electronics FAD1 DC Axial Fans are offered in a large variety of bearing types: 2-Ball, 1-Ball 1-Sleeve, Sleeve, and Hydro-Dynamic with a wide range of speeds. The FAD1 fans are available from 3.3VDC to 60VDC and sizes from 20mm to 254mm with a large array of functions and special features. The DC axial fans are produced in high tech facilities assuring high-quality standards with large production capabilities.