# Directive 2009/142/EC of the European Parliament and of the Council of 30 November 2009 relating to appliances burning gaseous fuels (codified version) (Text with EEA relevance), Division 3.2.3: Appliances intended to be used in indoor spaces and rooms must be fitted with a special device which avoids a dangerous accumulation of unburned gas in such spaces or rooms.

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

Appliances which are not fitted with such devices must be used only in areas where there is sufficient ventilation to avoid a dangerous accumulation of unburned gas.
Member States may define on their territory adequate space ventilation conditions for the installation of such appliances, bearing in mind the features peculiar to them.
Large-scale kitchen appliances and appliances powered by gas containing toxic components must be equipped with the aforesaid device.

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Source: https://www.legislation.gov.uk/eudr/2009/142/annex/I/division/3/division/3.2/division/3.2.3 (the official version)
Page: https://openlegislation.uk/eu-directive-2009-142/annex-I/division-3/division-3.2/division-3.2.3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.