Which of the following BEST describes fan affinity laws when motor speed is reduced to 80% of design?
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A
Flow reduces to 80%, pressure reduces to 64%, power reduces to 51%
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B
Flow reduces to 80%, pressure reduces to 80%, power reduces to 80%
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C
Flow reduces to 64%, pressure reduces to 51%, power reduces to 80%
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D
Flow reduces to 80%, pressure reduces to 51%, power reduces to 64%