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Old 07-04-16, 03:26 PM   #2
roflwaffle
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That's a good question. The only thing I found while searching for that info was a reference to the optimal height being 8-9+ feet, probably to minimize the space between the fan and the person being cooled, and that there was some maximum distance at which fans were within their rated efficiency.

My guess is that most ceiling fans are relatively inefficient, and focusing on blade design probably gives better bang for the buck.

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