{
  "url": "https://openlegislation.uk/heathrow-airportlondon-noise-insulation-grants-scheme-1989/schedule/paragraph-3",
  "json_url": "https://openlegislation.uk/heathrow-airportlondon-noise-insulation-grants-scheme-1989/schedule/paragraph-3.json",
  "legislation": "uksi/1989/247",
  "legislation_title": "The Heathrow Airport–London Noise Insulation Grants Scheme 1989",
  "legislation_url": "https://openlegislation.uk/heathrow-airportlondon-noise-insulation-grants-scheme-1989",
  "path": "schedule/paragraph/3",
  "kind": "paragraph",
  "number": "3",
  "heading": "Items required to be included in insulation works",
  "text": "Where there is any flued combustion appliance of any output rating in a room to be insulated under this Scheme, a vent or vents may be installed provided that the total effective area provided by an appropriate number of permanant vent type “A” shall be not less than the effective area in square millimetres calculated from 550H-1940 (where H is the total output rating in kilowatts of flued combustion appliances present in the room) so, however, that the total effective area provided shall be not less than 3,250 square millimetres and the total effective area provided in square millimetres added to 1940 shall be not less than the cross-sectional area of the flue connection in square millimetres.",
  "extent": null,
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/uksi/1989/247/schedule/paragraph/3",
    "retrieved_at": "2026-10-29T15:49:39.256906+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."
}