If a whole ventilation unit is designed, manufactured and delivered under the approach that it is a bidirectional ventilation unit (in line with the relevant definitions given in Regulations (EU)1253/2014 and 1254/2014), it derives that is should be considered as a bidirectional ventilation unit. Therefore, the energy label and the compliance with the Ecodesign requirement should be evaluated accordingly.
If several different components, among which various UVUs, are assembled on site (into a ventilation system, parts of which might have already been installed; this could be e.g. the case of an already existing ventilation system, where it is needed to only replace the supply – or exhaust – unit), and each UVU is delivered separately and capable to work independently from the others, in this case each UVU should be assessed separately.
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.