In that case, it would be necessary to determine if the action on the central fan is restricted to the range hood function (i.e. collecting contaminated air from above a hob) or if it is a broader function (i.e. collecting air from the dining area for instance).
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.