# The Heating Appliances (Fireguards) (Safety) Regulations 1991, Paragraph 1


No naked flame or incandescent part of the firebed projects more than 50 millimetres from the vertical plane of the fireplace opening.

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Source: https://www.legislation.gov.uk/uksi/1991/2693/schedule/paragraph/1 (the official version)
Page: https://openlegislation.uk/heating-appliances-fireguards-safety-regulations-1991/schedule/paragraph-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.