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It appears that there are blades, or at least impellers of some sort, hidden in the base, so the circular apparatus is simply a duct through which the air is forced. Apparently the directing of the air around the curve induces some sort of venturi effect. Pretty cool.
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Brad
Member- Eagle Heights PCA
Winchester, VA
Pro 16:33 The lot is cast into the lap; but the whole disposing thereof is of the LORD.
Isa 8:20 To the law and to the testimony: if they speak not according to this word, it is because there is no light in them.
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