A centrifugal fan rotor having a frame with a rotary axis and aplurality of blades on the frame at circumferentially spaced locations aroundthe rotary axis. The plurality of blades each has a leading edge and atrailingedge radially outside of the leading edge. The plurality of blades each hascircumferentially oppositely facing first and second surfaces each extendingbetween respective leading and trailing edges. The plurality of blades eachhas a material bonded at the leading edge and over only a portion of theexposed surface area of one of the first and second surfaces.