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How should one measure the airflow sensitivity to pressure variations for small unidirectional units?

For the measurement of the airflow sensitivity to pressure variations at + 20 Pa and – 20 Pa in small unidirectional (exhaust or supply) RVUs with an electric power input of less than 30 W (outside the scope of Regulation (EU) 1253/2014 except for information requirements), pressure variations will influence the airflow rate to a large degree, as the test pressure often exceeds the unit’s maximum provided pressure.

Therefore, in this specific case, the declared value for airflow sensitivity to pressure variations will be “not applicable.”

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.