# Council Regulation (EC) No 1099/2009 of 24 September 2009 on the protection of animals at the time of killing (Text with EEA relevance), Division 1.4: When containers are put one on top of the other, the necessary precautions shall be taken:

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

(a) to limit urine and faeces falling on the animals placed underneath;
(b) to ensure stability of the containers;
(c) to ensure that ventilation is not impeded.

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Source: https://www.legislation.gov.uk/eur/2009/1099/annex/III/division/1/division/1.4 (the official version)
Page: https://openlegislation.uk/eu-regulation-2009-1099/annex-III/division-1/division-1.4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.