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What is fan energy index (Fei)?

1. Purpose and Scope This standard defines the calculation method for the fan energy index (FEI), which is an energy efficiency metric for fans inclusive of motors and drives. This metric provides a standardized and consistent basis to compare fan energy performance across fan types and sizes at a given fan duty point.

How are Fei ratings calculated for fan arrays?

When FEI ratings are calculated for fan arrays per this annex, they must be clearly labeled as to the number of fans used in the array. Total required airflow through a fan array is 50,000 cfm at a fan static pressure of 6.0 in. wg. at standard air density. Multiple quantities of fans are being considered for this application.

How does a fan electrical input power calculation work?

It calculates the fan electrical input power based on the tested fan performance, the known full load motor efficiency and assumed default losses.

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