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Fans. Efficiency classification for fans - Driven fans at maximum operating speed Ingestion-build-67170 study A addresses requirements needed1 Scope This document establishes a system for the classification of fan efficiency for all fan types driven by motors of nominal rating 0,125 kW and above. It applies to driven fans only, but not to the system (finished original equipment manufacturers product, for example box fans and roof fans or ventilation system) in which they might be installed. This document describes a number of different procedures to classify the efficiency of a fan or to