43. In every ship constructed on or after 31st October 1992 of Class II(A), Class III, Class IV, Class V carrying 250 passengers or more operating in Category B waters, Class V carrying 50 passengers or more operating in Category C waters, Class VI carrying 50 passengers or more and Class VI(A), all accommodation bulkheads, linings, ceilings and their associated grounds shall be constructed of non-combustible materials and the exposed surfaces shall be such that a surface spread of flame of Class 2 will not be exceeded.