I don't think that ceiling fans move the most possible air when they are mounted close to the ceiling. Basically, the air can't get above the fan quick enough to replace the air blown down.
Our lanai fans move only what seems like half the air of our living room fan. The lanai fans are mounted about 10 inches below the 8 foot ceiling, while the living room fan is mounted on a pole about 3 feet below the 12 foot ceiling in our living room.
So....it is possible that even if you get a more powerful fan for your lanai that it really can't move more air than your current one. If you have a high ceiling in your lanai, you might try dropping the fan down as an experiment.
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