# The Oil Heaters (Safety) Regulations 1977, Paragraph 3


If, in the case of a heater fitted with a short drum burner, the flame is displaced during the 5 minute period specified in paragraph 2 of this Schedule so that the flame burns at the base of the heater, the heater shall be exposed to the draught specified in that paragraph for a further 30 minutes. During this further period no flame shall appear outside the heater.

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Source: https://www.legislation.gov.uk/uksi/1977/167/schedule/3/paragraph/3 (the official version)
Page: https://openlegislation.uk/oil-heaters-safety-regulations-1977/schedule-3/paragraph-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.