# The Welfare of Farmed Animals (England) Regulations 2007, Paragraph 2


In all systems in which laying hens are kept—
(a) the sound level must be minimised;
(b) constant or sudden noise must be avoided; and
(c) ventilation fans, feeding machinery and other equipment must be constructed, placed, operated and maintained in such a way that they cause the least possible noise.

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Source: https://www.legislation.gov.uk/ukdsi/2007/9780110773612/schedule/5/paragraph/2 (the official version)
Page: https://openlegislation.uk/draft-welfare-of-farmed-animals-england-regulations-2007/schedule-5/paragraph-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.