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5. Provided also that any of tlie requirements contained in Part 111 of this Convention may be varied in the case of any ship if the competent authority is satisfied, after consultation with the organization of shipowners and/or the shipowners and with the bona fide trade unions of seafarers, that the variations to be made provide corresponding advantages as a result of which the over-all "conditions are not less favourable than those which would result from the full application of the provisions of the Convention; particulars of all such variations shall be communicated by the Member to the Director-General of the International Labour Office, who shall notify the Members of the International Labour Organization. (c) Article 7 of the Accommodation of Crews Convention (Revised), 1949 (replaces Article 7 of the Accommodation of Crews Convention, 1946) : 1. Sleeping rooms and mess rooms shall be adequately ventilated. 2. The system of ventilation shall be controlled so as to maintain the air in a satisfactory condition and to ensure a sufficiency of air movement in all conditions of weather and climate. 3. Ships regularly engaged on voyages in the tropics and the Persian Gulf shall be equipped with both mechanical means of ventilation and electric fans : Provided that one only of these means need be adopted in spaces where this ensures satisfactory ventilation. 4. Ships engaged outside the tropics shall be equipped with either mechanical means of ventilation or electric fans. The competent authority may exempt ships normally employed in the cold waters of the Northern or Southern Hemispheres from this requirement. 5. Power for the operation of the aids to ventilation required by paragraphs 3 and 4 shall, when practicable, be available at all times when the crew is living or working on board and conditions so require. (d) Paragraph 10 of Article 10 of the Accommodation of Crews Convention (Revised), 1949 (replaces Paragraph 10 of Article 10 of the Accommodation of Crews Convention, 1946) 10. With a view to ensuring adequate and more comfortable accommodation the competent authority may, after consultation with the oganizations of shipowners and/or the shipowners and the bona fide trade unions of seafarers, grant permission to accommodate up to ten ratings per sleeping room in the case of certain passenger ships. (e) Paragraph 14 of Article 10 of the Accommodation of Crews Convention (Revised), 1949 (replaces Paragraph 14 of Article 10 of the Accommodation of Crews Convention, 1946) : 14. Berths shall not be arranged in tiers of more than two ; in the case of berths placed along the ship's side, there shall be only a single tier where a side light is situated above a berth. (/) Article 18 of the Accommodation of Crews Convention (Revised), 1949 (replaces Article 18 of the Accommodation of Crews Convention, 1946) : 1. Subject to the provisions of paragraphs 2, 3, and 4 of this Article, this Convention applies to ships the keels of which are laid down subsequent to the coming into force of the Convention for the territory of registration.

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