Section 7

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.

Ships regularly engaged on voyages in the tropics and the Persian Gulf shall be equipped with both mechanical means of ventilation and electric fans, except that one only of these means need be adopted in spaces where this ensures satisfactory ventilation.

Except for those ships normally employed in the cold waters of the northern or southern hemispheres, ships engaged outside the tropics shall be equipped with either mechanical means of ventilation or electric fans.

Power for the operation of the aids to the ventilation required by sub-regulations (3) and (4) shall, when practicable, be available at all times when the crew is living or working on board and when conditions so require.

Heating system.