Tactile Transducers As Fans: Energy Efficient?

In the summer, an acquaintance of mine uses Tactile Transducers as fans. The transducers are modified so that they vibrate a ricepaper partition-style structure. These structures are then arranged in a semi-circle — and they create quite a breeze. The question is: are they energy efficient? But remember they are also serving a dual purpose as speakers. The transducers are the gold models from Clark Synthesis.

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