# Commission Regulation (EU) No 327/2011 of 30 March 2011 implementing Directive 2009/125/EC of the European Parliament and of the Council with regard to ecodesign requirements for fans driven by motors with an electric input power between 125 W and 500 kW (Text with EEA relevance), Division 3.3: The fan gas power, Pu(s) (kW), is calculated according to the measurement category test method chosen by the fan supplier:

Extent: E+W+S+N.I.

(a) where the fan has been measured according to measurement category A, fan static gas power Pus is used from the equation Pus = q · psf · kps;
(b) where the fan has been measured according to measurement category B, fan gas power Pu is used from the equation Pu = q · pf · kp;
(c) where the fan has been measured according to measurement category C, fan static gas power Pus is used from the equation Pus = q · psf · kps;
(d) where the fan has been measured according to measurement category D, fan gas power Pu is used from the equation Pu = q · pf · kp.

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Source: https://www.legislation.gov.uk/eur/2011/327/annex/II/division/3/division/3.3 (the official version)
Page: https://openlegislation.uk/eu-regulation-2011-327/annex-II/division-3/division-3.3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.