Direct Replacement and Hub Type Some of our fastest moving direct replacement fan blades. General Purpose Series 32 assorted 3" thru 8" dia. popular fan blades for 1/8", 3/16" and 5/16" shaft sizes. Colour coded for ease of rotation identification: white for CW, gray for CCW. *Light weight *Reduce Vibration *Reduce bearing wear *Eliminates bent or misaligned blades *Integral hub *Low air noise