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Fan Filter Units - Metrics
Unit Airflow Rate (Speed) - Airflow rate through the FFU tested with a specific static pressure, in cfm or m3/min (fpm, or m/s for airflow speed).Total Power Usage - Total electrical power input to operate the FFU at certain airflow conditions, including the fan motor, controller, etc. in W.
Airflow Velocity Power - Portion of the total power that is moving air through the FFU at certain airflow conditions, in W.
Total Pressure (Power) Efficiency - Ratio of airflow velocity power to total power input to an FFU, %. A higher value indicates higher operating efficiency.
Energy Performance Index (EPI) - Unit's total power usage normalized by the airflow rate through the FFU under certain conditions, in W/cfm. Lower values correspond to higher operating efficiency.
