Drive losses occur on every belt driven fan. The losses can add as much as 10% - 15% to the power required to deliver the air as specified. The losses must be added to the fan's specified brake horse power in order to attain the specified performance.

For example, a catalog performance chart for a fan delivering 1500 CFM shows 0.70 horsepower without drive losses, may actually draw 0.80 horsepower including the power for the drive assembly.

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