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The Fan Energy Index (FEI) is a simple ratio that compares the electrical input power of a reference fan system to that of an actual fan system at a specific duty point. It is a comprehensive metric of comparative energy usage that encompasses motors, drives, and variable frequency drives (VFDs). It is also a mandate that appears in energy codes and efficiency regulations. Our guide outlines why fans with higher FEI ratings run more efficiently and examines the inputs that lead to an FEI rating. It also includes recommendations for incorporating FEI into a fan schedule.

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