Section 46(1) in The Merchant Shipping (Fire Appliances) Rules, 1969
(1)In every ship to which these rules apply there shall be provided means for stopping ventilating fans serving machinery, accommodation and cargo spaces. For machinery and cargo spaces there shall be provided means for closing all skylights, doorways, ventilators, annular spaces round the funnels and other openings to such places. Such means shall be capable of being operated from positions outside the said spaces which would not be made inaccessible by a fire within such spaces.
