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70. Bulkheads within a main vertical zone
(1) Every bulkhead within the accommodation spaces or service spaces of every ship to which this Part applies, not being a bulkhead required by these regulations to consist of an “A” Class division, shall consist of a “B” Class or a “C” Class division as prescribed in Table 1 and Table 2 of regulation 71. All such divisions may be faced with combustible materials in accordance with the provisions of regulation 77.
(2) All corridor bulkheads where not required to be “A” Class, shall be “B” Class divisions, which shall extend from deck to deck except—
(a) when continuous “B” Class ceilings and/or linings are fitted on both sides of the bulkhead, the portion of the bulkhead behind the continuous ceiling or lining shall be of a material which in thickness and composition meets the requirements of “B” Class divisions, but which is required to meet “B” Class fire integrity standards only so far as is, with regard to a particular case, reasonable and practicable in the opinion of the Director; and
(b) in the case of a ship protected by an automatic sprinkler system complying with the provisions of Schedule 11 to the Merchant Shipping (Safety) (Fire Appliances) (Ships Built On or After 25 May 1980 but Before 1 September 1984) Regulations (Cap. 369 sub. leg. X), a corridor bulkhead of “B” Class integrity may terminate at a ceiling in the corridor, provided that such a ceiling is of a material which, in thickness and composition, is acceptable in the construction of “B” Class divisions. Notwithstanding the requirements of regulation 71, such bulkheads and ceilings are required to meet “B” Class fire integrity standards only as far as is, with regard to a particular case, reasonable and practicable in the opinion of the Director. All doors and frames in such bulkheads shall be of non-combustible materials and shall be constructed and erected so as to provide fire resistance which the Director is satisfied is adequate. (E.R. 3 of 2022)
(3) Every bulkhead required to be a “B” Class division, except a corridor bulkhead, shall extend from deck to deck and to the shell or other boundaries unless continuous “B” Class ceilings and/or linings are fitted on both sides of the bulkhead, in which case the bulkhead may terminate at the continuous ceiling or lining.

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72. Protection of stairways and lifts in accommodation and service spaces
(1) All stairways shall be of steel frame construction except where the Director may approve the use of other equivalent material, and shall be within enclosures formed of “A” Class divisions, except that—
(a) a stairway connecting only 2 decks need not be enclosed on both decks provided the integrity of the deck is maintained by proper bulkheads or doors at one between-deck. When a stairway is closed at one between-deck space, the stairway enclosure shall have the same integrity standard as is required by Table 2 of regulation 71 for the deck which separates the between-deck spaces; and
(b) stairways may be fitted in the open in a public space provided they lie wholly within such public space.
(2) Every opening in a stairway enclosure shall be provided with a means of closure which shall be permanently attached thereto.
(3) Every stairway enclosure shall have direct communication with the corridors and be of sufficient area to prevent congestion having regard to the number of persons likely to use them in an emergency. In so far as practicable, stairway enclosures shall not give direct access to cabins, service lockers or other enclosed spaces containing combustibles in which a fire is likely to originate.
(4) Every lift trunk shall be so fitted as to prevent the passage of smoke and flame from one between-deck to another and shall be provided with means of closing so as to permit the control of draught and smoke.

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74. Openings in “B” Class divisions
(1) Where a “B” Class division is pierced for the passage of electric cables, pipes, trunks, girders, beams, or for other purposes, the arrangements shall be such that the effectiveness of the division in resisting fire is not thereby impaired except as provided in subregulation (5).
(2) All doors and door frames in “B” Class divisions and means of securing them shall provide a method of closure which shall have resistance to fire as far as practicable equivalent to the division, except that ventilation openings may be permitted in the lower portion of such doors. Where such opening is in or under a door the total net area of any such opening or openings shall not exceed 0.05 square metre. When such opening is cut in a door it shall be fitted with a grill made of steel. Doors shall be non-combustible.
(3) The requirements for “B” Class integrity of the outer boundaries of a ship shall not apply to glass partitions, windows and sidescuttles. Similarly, the requirements for “B” Class integrity shall not apply to exterior doors in superstructures and deckhouses.
(4) A door which separates a cabin from an individual interior sanitary space, such as a shower space, may be constructed of combustible materials.
(5) Where an automatic sprinkler system complying with the provisions of Schedule 11 to the Merchant Shipping (Safety) (Fire Appliances) (Ships Built On or After 25 May 1980 but Before 1 September 1984) Regulations (Cap. 369 sub. leg. X) is fitted— (E.R. 3 of 2022)
(a) the closing of openings in decks need only meet the “B” Class integrity requirements in so far as is reasonable and practicable; and
(b) openings in corridor bulkheads of “B” Class materials shall be protected in accordance with the provisions of regulation 70.

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76. Windows and sidescuttles
(1) All windows and sidescuttles in bulkheads within accommodation and service spaces and control stations other than those to which the provisions of regulations 73(8) and 74(3) apply, shall be constructed so as to preserve the integrity requirements of the type of bulkheads in which they are fitted.
(2) Notwithstanding the requirements of the Tables at the end of regulation 71—
(a) all windows and sidescuttles in bulkheads separating accommodation and service spaces and control stations from weather shall be constructed with frames of steel or other suitable material. The glass shall be retained by a metal glazing bead or angle; and
(b) the fire integrity of windows facing opening or enclosed lifeboat and liferaft embarkation areas and of windows situated below such areas in such a position that their failure during a fire would impede the launching of, or embarkation into, lifeboats or liferafts shall be such that any potential fire hazard is kept to a minimum.