Artikel 7

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. Vessels regularly engaged on voyages in the tropics and other areas with similar climatic conditions shall, as required by such conditions, be equipped both with mechanical means of ventilation and with electric fans: Provided that one only of these means need be adopted in spaces where this ensures satisfactory ventilation.
4. Vessels engaged elsewhere shall be equipped either with mechanical means of ventilation or with electric fans. The competent authority may exempt vessels 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 of this Article shall, when practicable, be available at all times when the crew is living or working on board and conditions so require.