{
  "url": "https://openlegislation.uk/eu-regulation-2011-327/annex-II/division-3/division-3.2",
  "json_url": "https://openlegislation.uk/eu-regulation-2011-327/annex-II/division-3/division-3.2.json",
  "legislation": "eur/2011/327",
  "legislation_title": "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)",
  "legislation_url": "https://openlegislation.uk/eu-regulation-2011-327",
  "path": "annex/II/division/3/division/3.2",
  "kind": "division",
  "number": "3.2",
  "heading": "Where the fan is supplied as ‘not final assembly’, the fan overall efficiency is calculated at the impeller’s optimum energy efficiency point, using the following equation:",
  "text": "ηe = ηr · ηm · ηT · Cm · Cc\nwhere:\nηe is the overall efficiency;\nηr is the fan impeller efficiency according to Pu(s) / Pa\nwhere:\nPu(s) is fan gas power determined at the point of optimal energy efficiency for the impeller and according to point 3.3 below;\nPa is the fan shaft power at the point of optimal energy efficiency of the impeller;\nηm is the nominal rated motor efficiency in accordance with Regulation (EC) No 640/2009 whenever applicable. If the motor is not covered by Regulation (EC) No 640/2009 or in case no motor is supplied a default ηm is calculated for the motor using the following values:\nif the recommended electric input power ‘Pe’ is ≥ 0,75 kW,\nηm = 0,000278*(x3) – 0,019247*(x2) + 0,104395*x + 0,809761,\nwhere x = Lg (Pe),\nand Pe is as defined in 3.1(a),\nif the recommended motor input power ‘Pe’ is < 0,75 kW,\nηm = 0,1462*ln(Pe) + 0,8381,\nand Pe is as defined in 3.1(a), where the electric input power Pe recommended by the manufacturer of the fan should be enough for the fan to reach its optimum energy efficiency point, taking into account losses from transmission systems if applicable.\nηT is the efficiency of the driving arrangement for which the following default values must be used:\nfor direct drive ηT = 1,0;\nif the transmission is a low-efficiency drive as defined in 1(9) and\nPa ≥ 5 kW, ηT = 0,96, or\n1 kW < Pa < 5 kW, ηT = 0,0175 * Pa + 0,8725, or\nPa ≤ 1 kW, ηT = 0,89,\nif the transmission is a high-efficiency drive as defined in 1(10) and\nPa ≥ 5 kW, ηT = 0,98,\nor 1 kW < Pa < 5 kW, ηT = 0,01 * Pa + 0,93, or\nPa ≤ 1 kW, ηT = 0,94.\nCm is the compensation factor to account for matching of components = 0,9;\nCc is the part load compensation factor:\nfor a motor without a variable speed drive Cc = 1,0,\nfor a motor with a variable speed drive and Ped ≥ 5 kW, then Cc = 1,04,\nfor a motor with a variable speed drive and Ped < 5 kW, then Cc = – 0,03 ln(Ped) + 1,088.",
  "extent": "E+W+S+N.I.",
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/eur/2011/327/annex/II/division/3/division/3.2",
    "retrieved_at": "2026-11-01T14:50:13.631487+00:00"
  },
  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives."
}