# Directive 2009/45/EC of the European Parliament and of the Council of 6 May 2009 on safety rules and standards for passenger ships (Recast) (Text with EEA relevance), Division .7.1: For reasons of noise reduction, the Administration may approve, as an equivalent, doors with built-in ventilation sound-locks with openings at the bottom on one side of the door and at the top on the other side, on condition that the following provisions have been complied with:

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

.1 The upper opening shall always face towards the corridor and shall be provided with a grating of non-combustible material and an automatically operating fire damper, which is activated at a temperature of about 70 °C.
.2 The lower opening shall be provided with a grating made of a non-combustible material.
.3 The doors shall be tested in accordance with Resolution A.754(18).

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Source: https://www.legislation.gov.uk/eudr/2009/45/annex/I/chapter/3/part/B/division/7/division/6/division/.7.1 (the official version)
Page: https://openlegislation.uk/eu-directive-2009-45/annex-I/chapter-3/part-B/division-7/division-6/division-.7.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.