What determines the minimum horsepower requirement for Greenheck centrifugal and industrial fans?
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Minimum horsepower for centrifugal and industrial fans is based on either the operating brake horsepower or the minimum starting horsepower of the fan. Operating brake horsepower is an obvious limit to the minimum motor horsepower, since the motor horsepower must exceed the operating brake horsepower for the fan to work. Minimum starting horsepower is based solely on the horsepower required to get the fan wheels rotating. Minimum starting horsepower becomes a significant factor for single width wheels above size 49 and double width sizes above 44.
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