The calculation of the AEC is based on the electric power input (WBEP) of the domestic range hood at the best efficiency point BEP (i.e. at the maximum value of the efficiency of a range hood). For fixing the BEP, the highest possible speed setting of the fan is to be used, including the boost position, if any.
Disclaimer: Please note that the European Commission cannot provide a legally binding interpretation of the EU legislation, as this is the sole competence of the European Court of Justice. Any remarks from the European Commission services are without prejudice to the position the Commission might take should related cases arise in a procedure before the Court of Justice.