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Old 07-16-2013, 11:50 AM
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The number of fan blades alone does not determine how much air a given fan will move. Automakers will vary the number of blades, blade spacing, blade shape, and fan diameter based on available space and even things like noise reduction. A seven blade fan is probably quieter, not necessarily more efficient than a five blade. Fans are also optimized for a specific RPM range. This is like designing a propeller.
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