The bionic fan NB-eLoop is a particularly good example of how form and material follow function. The innovative shape of the rotor is the result of an evolution bionic development process. The loop rotor dissolves turbulence in the air flow. Both the loudness level of the air flow and the energy consumption are reduced significantly. The effect is underpinned by velocity guides at the rears of the blades. The design preserved the straight line of the rear blade edge. Resonance transformers in the frame corners shift the frequency spectrum to an optimal range, the result being the least noise emitting fan of the world.