# The Welfare of Livestock Regulations 1994, Paragraph 4


Subject to paragraph 22 of this Part, insulation, heating and ventilation of the building must ensure that the air circulation, dust level, temperature, air relative humidity and gas concentrations are kept within limits which are not harmful to the pigs.

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Source: https://www.legislation.gov.uk/uksi/1994/2126/schedule/3/paragraph/4 (the official version)
Page: https://openlegislation.uk/welfare-of-livestock-regulations-1994/schedule-3/paragraph-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.