one side of the v shaped cut out of the fan blade 28 the first end 32 of the fan blades 28 each defines at least one bore 58 therethrough the split blade embodiment pictured herein includes two bores 58 extending through each blade segment 56 each channel floor 50 may include at least one retaining member 60 extending upwards therefrom the blade holder 30 embodiment of fig3 includes four retaining members 60 each being generally cylindrical in shape corresponding to the bores 58 through the fan blades 28 at least a portion of the retaining member 60 extends through the bore 58 in the fan blade segment 56 seated within the channel 52 a fastener such as a screw 62 extends through the bores 58 and into the retaining member 60 to fix the fan blade 28 within the channel 52 alternate fastening methods may be employed such as providing openings in the channel floor 50 either in lieu of the retaining members 60 or in conjunction therewith wherein a bolt extends through the channel floor 50 and the blade 28 with a nut threaded thereabout a cover plate 64 may fit over the fan blade segment 56 such that it is sandwiched between the channel floor 50 and the cover plate 64 an embodiment of the cover plate 64 is illustrated in fig4 the cover plate 64 further defines a bore.