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.