A fan rotor is mounted on a shaft carried on bearings attached to a base plate and there is provided an assembly for preventing reverse rotation of the fan which could damage the motor. Team members may quantifiably evaluate other team members or work group members relative to each other by allocating points from a point pool to each member according to the team member’s subjective evaluation. The radial struts emanate from a junction within the undulating perimeter with their outer ends connected to the undulating perimeter of the frame.